jdthe4th. Hi guys, I've been scouring the web looking for ways to connect my iMac to my Mac Pro to use the iMac screen as a second display. The only catch is I still want to run the iMac as as stand alone computer. I should mention that the two are already connected via LAN for music production and I need to be able to access the iMac ...Right now the iMac is acting as a third monitor on the M1 Mac mini in a Space. I can just change the space if I want to use the iMac as an iMac. The 2010 iMac 27 has Target Display Mode from anything that can output a DisplayPort signal on a MiniDisplayPort cable, so PCs, game consoles and other Macs - no restrictions.Choose Apple menu > System Preferences, then click Keyboard. If ”Use F1, F2, etc. keys as standard function keys” is selected, target display mode uses Command-Fn-F2 instead of Command-F2. It might also help to use the keyboard that came with your iMac. Some third-party keyboards and older Apple keyboards don't support target display mode.Dec 2, 2021, 9:52 AM PST. Luna Display’s latest update adds a helpful new feature: allowing you to hook up a Windows PC to a Mac laptop or desktop (including Apple’s flash M1 iMacs) to use as ...Sep 24, 2023 ... In this video I use a couple work arounds to get a triple display set up for my new M1 MacBook Air M1. this will allow you to use any old ...Unfortunately your MacBook isn't compatible with Target Display Mode when using an iMac with Thunderbolt. The only way you'd be able to use your iMac as a monitor is via some form of streaming (which wouldn't be as good as a direct connection) or by gutting the iMac and installing a display controller board. Here's a compatibility chart for ...Nope. Neither of those Mac's, the 2017 iMac or the M2 Mac mini support Target Display Mode. carefully read > Use your iMac as a display with target display mode - Apple Support. If you go with the M2 Mac mini, best bet is to get an aftermarket external display and then possible use the old cinema display as a second display. …I would like to use the IMAC 27" 5K as the monitor for the laptop and hook up a keyboard and mouse to use. The only purpose for using the MacBook Pro would be as the hard drive. Would like to use the IMAC screen and my secondary screen set up as the monitors. I would also like to use the IMAC camera and speaker and mic as well. Is this …Put the iMac into Target Display Mode. Once you have connected your MacBook and iMac using the appropriate cable, all you should need to do is enter Target Display Mode on the iMac. This can be done by pressing Command-F2 on the iMac’s keyboard. Press the same combination to go back to normal, or simply unplug the video …Jan 3, 2024 · A. Yes, you can use 24-inch and 27-inch iMacs released from 2009 and 2010, and iMacs shipped from 2011, 2012, and 2013 as monitors for PCs by running iMac Target Display Mode. Only either Mini DisplayPort or Thunderbolt port is required. If your PC doesn’t feature these ports, you can use a HDMI port with a suitable adapter. Since iMac has an impressing display function, you can use it as a monitor for a Windows PC. This post will give you a step-by-step guide on how to use iMac as …So much has changed about the way we take pictures these days that it makes sense that the way we display them has also changed. Instead of having them printed and framed, you can ...To use iMac as a monitor for a PC, here are simple steps for you to follow. #1 Turn off Both Devices and Connect Mini Display on iMac. The first thing that you need to do is to turn off the iMac device and PC. Connect the cable to your HDMI, or from your Display Port going to your Windows computer or your laptop.Review the document: Use your iMac as a display with target display mode - Apple Support. Target display mode is a feature available with late 2009-Mid 2014 iMacs. The display Mac has to be running macOS High Sierra or older and the signal producing Mac has to be running macOS Catalina (ca. 2019) or earlier.Luna Display is a product by Astropad that lets you turn an iPad into a wireless second display. The $130 offering uses a dongle and works with Windows PCs and Macs. Its "headless" mode turns the ...Use your iMac as a display with target display mode - Apple Support. Apple started the deprecation of TDM in Late 2014 and threw the last shovel of dirt in its face in Early 2020. It's dead tech. There may be software options but most are laggy. You best results will be with a proper, free-standing external monitor.This is not possible. As stated in this apple support article, the device projecting to the iMac in target display mode must be made before 2019. Target Display mode will not project to the iMac with your new MacBook pro-2021. AirPlay only works for devices released after 2019. This means, funnily enough, your iMac can project its …2009 and 2010 iMac works similar to each other, and are the most versatile with allowed cables. 2011 to 2014 require thunderbolt cables to be used with both, target and host. 5K and 4K models after mid 2014 do not support target display mode. Use your iMac as a display with Target Display Mode edit. I forgot to mention that not all screen sizes …Sep 22, 2014. 43. 2. Jan 19, 2021. #5. citivolus said: I'm happily using my Late 2009 iMac running High Sierra (not patched) in TDM mode with my M1 MacBook Air. Works perfectly with the Displaylink drivers installed on the MacBook, Dell D6000 Thunderbolt 3 dock, and this Mini DisplayPort to DisplayPort cable.27-inch iMac models introduced in 2009 and 2010: Use a Mini DisplayPort cable to connect your iMac to a Mini DisplayPort or Thunderbolt or Thunderbolt 2 port on the other Mac. All iMac models introduced in 2011, 2012, 2013, and mid 2014: Use a Thunderbolt cable to connect your iMac to a Thunderbolt or Thunderbolt 2 port on How to use target display mode. Make sure your iMac has started up and meets the system requirements above. Make sure the other Mac has started up and is logged in to a macOS user account. You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other Mac (not the ... Feb 2, 2024 · You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other Mac (not the other iMac). Press Command-F2 on the keyboard of the iMac. You should now see the desktop of the other Mac. To exit target display mode, press Command-F2 again. If you are a company trying to garner new business at a trade show, you have a limited amount of time to capture your audience’s attention before they walk to the next booth. Here ...Press ⌘ Command + F2 on the iMac. The iMac’s display will now show the MacBook’s screen instead of its own. You've successfully connected your MacBook to your iMac! If you're looking for more connection information, check out how to connect an external hard drive to your MacBook. Method 2.Steps to Set up Target Display Mode. Let me show you how to enable Target Display Mode and use your iMac as a secondary display. Time needed: 3 minutes. Follow the steps below to...If a display is too large and is causing some of the objects on the screen to be unseen, adjust the display size using the screen resizing buttons present on the monitor. Another o...Target Display Mode is a feature that allows you to use the display of an iMac to view the screen output from a second, external, Mac. For example, I am able to use Target Display Mode so that my late–2009 27" iMac can display the output from my late–2009 Mac mini.By using your iMac as a monitor, you can easily connect your laptop, gaming console, or any device with a compatible port to enjoy a larger screen and …With these, it is easy to proceed setting up: Step 1. Turn off both iMac and Mac and connect the Thunderbolt cable to their ports. Step 2. Turn on the devices, press the "Command+F2" keys on the iMac's keyboard to activate Target Display Mode. The iMac then will display Mac's screen.Nov 30, 2023 ... In this video I answer commonly asked questions regarding using an older iMac as a screen for your brand new silicon based M1, M2 & M3 Apple ...This is not possible. As stated in this apple support article, the device projecting to the iMac in target display mode must be made before 2019. Target Display mode will not project to the iMac with your new MacBook pro-2021. AirPlay only works for devices released after 2019. This means, funnily enough, your iMac can project its …Jan 5, 2024 · Tutorial of Using iMac as Monitor for PC: Step 1. Turn on your iMac and PC. Step 2. Press the "Cmd" + "F2" on the iMac keyboard to trigger Target Display Mode. It's also possible to press "Cmd" + "Fn" + "F2" instead. Step 3. Wait for a few seconds, and then you will see the PC screen mirrored on the iMac screen. Nov 20, 2023 · With Luna Display, you'll need to buy a USB-C dongle, which will run you $80, and Duet Display requires you to sign up for a $3 per month plan to use your Mac as a wired second display and $4 per ... Using an older iMac as a slave monitor: Followed directions... no go I have the following equipment: 21" iMac (late 2012), running High Sierra (10.13.6) 27" iMac (2019), running Catalina (10.14.4) The two computers are connected by a Thunderbolt 2 cable from the old iMac to a Thunderbolt 3 coupling device attached to the new computer. When I …Currently, I have my iMac 2011 at home connected to a Dell monitor using Thunderbolt to VGA cable. I want to to hook up my Latitude 7480 into that current setup, so that I may use the Dell laptop as the main screen, and my other two monitors at home as monitor displays. The iMac 2011 has four usb ports and one thunderbolt port. I currently …Jan 16, 2023 ... Comments · Converting An Apple Imac Into A Monitor - An Enjoyable Build! · Target Display Mode Guide: What iMacs can you use as a second monitor ...Jan 16, 2023 ... Comments · Converting An Apple Imac Into A Monitor - An Enjoyable Build! · Target Display Mode Guide: What iMacs can you use as a second monitor ...Jan 5, 2021 · How to Use an Old iMac as a Secondary / External Monitor. This video will show you the step by step process on how to use an old 2009-2014 Apple iMac as an e... The Luna Display allows an iMac to be used as a display for another Mac, but technically, it works with any two Mac combinations, so you can pair up two MacBooks, a Mac mini and a MacBook ...Choose iMac from the list of devices. If Macbook is using an OS older than Big Sur, tap the Apple icon and then go to System Preferences. Next, choose the Displays option and then tick the check box located in the lower-left corner. Now all the mirroring options will appear in the menu bar.Samsung’s newest phone has taken the tech world by storm. With its sleek design and impressive display, it’s no wonder why people are lining up to get their hands on this latest in...Use your iMac as a display with target display mode - Apple Support. Apple started the deprecation of TDM in Late 2014 and threw the last shovel of dirt in its face in Early 2020. It's dead tech. There may be software options but most are laggy. You best results will be with a proper, free-standing external monitor.An iMac makes an excellent external display for your Xbox gaming needs. It offers clear and high-resolution images, excellent sound output, and speed, all preferred qualities by gamers. To make the setup using the non-streaming method, that is using the cables for HDMI to Thunderport or Mini DisplayPort connectivity.In order to use Target Display Mode, both Macs must be turned on and must be awake (ie: not in sleep mode). In my examples, throughout this tutorial, I shall use …Mar 17, 2023 · Zando_. 2 hours ago, seanondemand said: The part you're mentioning is for the iMac you want to display with. For High Sierra, yes. For the connecting computer it needs to be running Catalina or older to be guaranteed to work: "The other Mac that you're connecting it to must have been introduced in 2019 or earlier and have macOS Catalina or ... How to use target display mode. Make sure your iMac has started up and meets the system requirements above. Make sure the other Mac has started up and is logged in to a macOS user account. You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other Mac (not the ...Servant of Cats. Level 5. 6,557 points. Posted on Jun 5, 2023 1:32 AM. Not as a monitor for an Apple Silicon Mini. Or as a monitor for any Mini running macOS or Big Sur or later. …Aug 21, 2023 · Posted on Aug 21, 2023 9:45 AM. To use any of these iMac models as an external display: The iMac used as a display must have macOS High Sierra or earlier installed. The other Mac that you're connecting it to must have been introduced in 2019 or earlier and have macOS Catalina or earlier installed. The cable connecting the two Mac computers must ... Jan 8, 2024 · Essentials for Setup: What You Need to Begin. Setting Up Your iMac as a Display: Key Steps. Understanding Limitations: Navigating Luna Display’s Limits. Boosting Performance: Tips for Optimal Use. Solving Problems: Effective Troubleshooting Strategies. Recommended Setup: Why Luna Display. Use your Mac as a display. You can use Airplay to Mac to stream video or share your screen from another Apple device to your Mac. Note: Use AirDrop & Handoff settings to …With these, it is easy to proceed setting up: Step 1. Turn off both iMac and Mac and connect the Thunderbolt cable to their ports. Step 2. Turn on the devices, press the "Command+F2" keys on the iMac's keyboard to activate Target Display Mode. The iMac then will display Mac's screen.Jan 16, 2023 ... Comments · Converting An Apple Imac Into A Monitor - An Enjoyable Build! · Target Display Mode Guide: What iMacs can you use as a second monitor ...Using new 24inch iMac as external monitor Hi all, I've got one question where I am struggling to find the information. I wondered if the new 24inch iMac (iMac 24-inch - Apple) can be used as an external monitor with a MacBook Pro (either the 2019 version, which I got, or a newer version with M1 card). ...Apr 21, 2021 · One of the handy features of older iMacs was Target Display Mode, an option that allowed you to use an iMac as an external display. While the feature hasn’t been offered in iMacs since 2014 ... Target Display Mode is a feature that allows you to use the display of an iMac to view the screen output from a second, external, Mac. For example, I am able to use Target Display Mode so that my late–2009 27" iMac can display the output from my late–2009 Mac mini.Feb 2, 2024 · You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other Mac (not the other iMac). Press Command-F2 on the keyboard of the iMac. You should now see the desktop of the other Mac. To exit target display mode, press Command-F2 again. Dec 2, 2022 · Click the Desktop tab in Duet on your iMac, and once you see your computer, you can select Mirror or Extend. You're connected! Now simply move your cursor to the edge of your primary display and it will automatically appear on the iMac. You can then drag windows and applications from your primary display to your iMac and vice versa. Can you connect a game console to an iMac? How to play Xbox, PlayStation, or Nintendo on any Mac, Macbook, Mac Mini, Mac Pro, or iMac with HDMI Input.Follow ...Oct 10, 2022 · Step 3. Move onto the PC and access the Action Center from the bottom-right corner. Select the Project tile and choose Connect to a wireless display. The PC will look for available displays, and ... Connecting the New Board. The iMac display should have two wires still left attached: (1) the display data cable and (2) the backlight cable. These are what you'll attach to the new display board. For the first, my board came with a new display data cable which completely replaced what was attached to the iMac display.Step 1: Connect the Mini Display to the back of your iMac. Step 2: Connect the HDMI cable from your Xbox to the adapter HDMI slot. Step 3: Once everything is connected, press COMMAND + F2 on your iMac to choose the Xbox as the desired screen output. This is a straightforward process however, the method may differ slightly between …Press Command-F2 on the iMac. If that doesn't work, try these other solutions: If you're currently logged in to the iMac that you want to use as a display, choose Apple menu > Log Out to return to the login window. Then press Command-F2 again. Choose Apple menu > System Preferences, then click Keyboard.Items invented in 1998 include Windows 98, the iMac computer and the MP3 player. Viagra was also approved for use by the United States Food and Drug Administration in 1998.Exit Target Display Mode: To exit Target Display Mode and return your iMac to its regular functions, simply press the Command (⌘) + F2 keys again or use the menu bar option, if available. Once you have enabled Target Display Mode, your iMac will display the screen content from the connected device.Aug 21, 2023 · Posted on Aug 21, 2023 9:45 AM. To use any of these iMac models as an external display: The iMac used as a display must have macOS High Sierra or earlier installed. The other Mac that you're connecting it to must have been introduced in 2019 or earlier and have macOS Catalina or earlier installed. The cable connecting the two Mac computers must ... I would like to use my iMac (5k, Retina, 2020 with macOS Monterey) as the 'screen' for my MacBook Pro. I remember doing this in the past with some older models but can't figure out how to do this now. I tried connecting the two iMAC and the MacBook via a USB-C cable but the MacBook is just getting charged. Any suggestions are appreciated.Dec 2, 2021, 9:52 AM PST. Luna Display’s latest update adds a helpful new feature: allowing you to hook up a Windows PC to a Mac laptop or desktop (including Apple’s flash M1 iMacs) to use as ...Jan 3, 2022 · I would like to use my iMac (5k, Retina, 2020 with macOS Monterey) as the 'screen' for my MacBook Pro. I remember doing this in the past with some older models but can't figure out how to do this now. I tried connecting the two iMAC and the MacBook via a USB-C cable but the MacBook is just getting charged. Any suggestions are appreciated. You can connect any of these older iMac models to another Mac from 2019 or earlier for use as an external display. Learn how to identify your iMac model. 27-inch iMac models introduced in 2009 and 2010: Use a Mini DisplayPort cable to connect your iMac to a Mini DisplayPort or Thunderbolt or Thunderbolt 2 port on the other Mac. All …In today’s fast-paced business environment, technology plays a crucial role in enhancing productivity and collaboration. One such technological advancement that has gained populari...Apple's own webpage on Target Display Mode says: 24-inch and 27-inch iMac models introduced in 2009 and 2010 To use any of these iMac models as an external display: The iMac used as a display must have macOS High Sierra or earlier installed. The other Mac that you're connecting it to must have been introduced in 2019 or earlier and have …If you are a company trying to garner new business at a trade show, you have a limited amount of time to capture your audience’s attention before they walk to the next booth. Here ...If you've got older Macs, using your iMac as an external monitor is easy and works great. In general, if you've got a MacBook and an iMac, using your iMac as a display for your MacBook can be a ...I can still use my Target Display Mode 2010 iMac as a second display with any Mac, or even a Windows PC. The main problem is that Apple has killed subpixel anti-aliasing, which makes any recent [email protected] is correct that you cannot use your Late 2013 iMac as a display for your PS5 using Target Display Mode, but I will expand on what iMacs are capable of using Target Display Mode, and with what devices for anyone else that is looking for help with this. For 27" iMacs: The Late 2009 and Mid 2010 iMacs can use Target Display Mode with …How to use target display mode. Make sure your iMac has started up and meets the system requirements above. Make sure the other Mac has started up and is logged in to a macOS user account. You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other …Nov 2, 2022 ... Nevertheless- congrats and all the best to the team who came up with the idea! I like repair and use “retro” stuff.Use iMac as monitor: 5 solutions. Table of contents. Luna Display or Duet Display. Use iMac as a monitor with Sidecar. Pair iMac with an external monitor. …Step 1: Connecting The Cables. Switch off your iMac and PC, then plug the cable into the Thunderbolt, HDMI, or Display port on your PC. Then, connect the cable into the Thunderbolt or Mini DisplayPort and your iMac. Note: If you are using an adapter, plug the cable into the adapter first, then connect the male end to the Mini Display ...Bottomline, there is no way to use your iMac as a direct video. display for any computer, Mac or PC as that feature was removed on. 5K iMacs as previously pointed out. However, depending on your use, you could install Microsoft Remote Desktop Mac. and view your PC over a network.Feb 2, 2024 · You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other Mac (not the other iMac). Press Command-F2 on the keyboard of the iMac. You should now see the desktop of the other Mac. To exit target display mode, press Command-F2 again. Step 1: Connecting The Cables. Switch off your iMac and PC, then plug the cable into the Thunderbolt, HDMI, or Display port on your PC. Then, connect the cable into the Thunderbolt or Mini DisplayPort and your iMac. Note: If you are using an adapter, plug the cable into the adapter first, then connect the male end to the Mini Display ...That feature went away when the first 5K iMac came out. There are "workaround" products (USB-C version of Luna DIspay; Duet Display) that might let you reuse the 27" 5K iMac as a second screen. You'd still need a real monitor for your main screen – and the workarounds could involve significant compromises.Feb 4, 2021 · Feb 4, 2021. #1. I have an old but fully functional 27” Late 2011 iMac that has a good screen and had a new GPU fitted. I also have an 11” 2015 Macbook Air. No I know I can use my 2011 as a monitor for my Macbook Air via a Thunderbolt cable. Now if I purchased a new M1 Mac Mini could I connect this to my 2011 iMac via the Apple Thunderbolt ... iMac Pro. Want to use your iMac as an extra display here’s what to do: Open System Preferences/System Settings on your Mac and select Displays. Click on Add Display. You’ll see the names of ...for artists: pair luna with astropad. Luna fully integrates with Astropad Studio — our award-winning drawing software that turns the iPad into a professional graphics tablet for Mac. Astropad offers absolute workflow customization, featuring a packed suite of creatives tools: Unlimited per-app shortcuts. Magic Gestures (tap/ Pencil shortcuts)Turn on both the iMac and the PC, then hold Cmd + F2 or Cmd + Fn + F2 on the iMac keyboard to trigger Target Display Mode. In a few seconds, you should be …Step 1: Connect the Mini Display to the back of your iMac. Step 2: Connect the HDMI cable from your Xbox to the adapter HDMI slot. Step 3: Once everything is connected, press COMMAND + F2 on your iMac to choose the Xbox as the desired screen output. This is a straightforward process however, the method may differ slightly between …
Yes, you can use your iMac as a display screen for a PC. To do this, your iMac must have a Thunderbolt port or Mini DisplayPort, and it must be in Target Display …. Ford mustang mach e range
How to use target display mode. Make sure your iMac has started up and meets the system requirements above. Make sure the other Mac has started up and is logged in to a macOS user account. You can use more than one iMac as a display, if each iMac is using a Thunderbolt cable to connect directly to a Thunderbolt port on the other …Use your iMac as a display with target display mode - Apple Support. Apple started the deprecation of TDM in Late 2014 and threw the last shovel of dirt in its face in Early 2020. It's dead tech. There may be software options but most are laggy. You best results will be with a proper, free-standing external monitor.I need to use my 2017 5k iMac as an external monitor for an employer-provided Windows 10 laptop. I understand that Apple discontinued support for Target Display mode for the 5k iMacs. (Wish I'd realized that before I bought it : ( ). Looking for SOME kind of work-around. Are there any 3rd-party applications for the iMac that would enable using ...When it comes to showcasing your products, having the right display cabinets can make all the difference. One of the biggest advantages of opting for custom display cabinets is tha...Make sure that your iMac is using macOS High Sierra 10.13.6 or earlier. You can't use target display mode with later versions of macOS, or with Boot Camp and Windows. …Posted on Feb 22, 2020 11:24 AM. There is no hardware support to do such a thing on your iMac. Up to the 2014 models you could use. Use your iMac as a display - Apple Support. Use your iMac as a display with target display mode - Apple Support. But on newer iMacs this is not supported in the hardware. You should go back and request a refund on ...If your Mac has Thunderbolt 3 (USB-C) ports, you can connect it using the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter. A Thunderbolt cable or a Mini DisplayPort to Mini DisplayPort cable. A supported iMac with OS X v10.6.1 or later. See the list below for iMac models that support Target Display Mode, the type of cable you need …I can still use my Target Display Mode 2010 iMac as a second display with any Mac, or even a Windows PC. The main problem is that Apple has killed subpixel anti-aliasing, which makes any recent ...To use any of these iMac models as an external display: The iMac used as a display must have macOS High Sierra or earlier installed. The other Mac that you're connecting it to must have been introduced in 2019 or earlier and have macOS Catalina or earlier installed. The cable connecting the two Mac computers must be a Thunderbolt or …If you are a company trying to garner new business at a trade show, you have a limited amount of time to capture your audience’s attention before they walk to the next booth. Here ...May 6, 2020 · Buy an HDMI to USB 3.0 video capture adapter to connect the 2 devices. On the iMac, install and Quick Camera, the iMac will see input video signal as another video source like the ISight webcam. You can minimize the windows or put it at fullscreen mode. On the PC, the video capture is seen as another display. If both devices meet system requirements, you can Use an iPad as a second display for a Mac. Find the system requirements for this below: "Sidecar system requirements. Sidecar works with these devices and operating systems. macOS Catalina or later. MacBook Pro introduced in 2016 or later.Dec 3, 2021 · Luna Display is a product by Astropad that lets you turn an iPad into a wireless second display. The $130 offering uses a dongle and works with Windows PCs and Macs. Its "headless" mode turns the ... If you’re in the market for custom display cabinets, you understand the importance of finding the perfect one to showcase your products or collectibles. Before diving into the worl...Oct 29, 2023 · To use any of these iMac models as an external display: The iMac used as a display must have macOS High Sierra or earlier installed. The other Mac that you're connecting it to must have been introduced in 2019 or earlier and have macOS Catalina or earlier installed. The cable connecting the two Mac computers must be a Thunderbolt or Thunderbolt ... Sep 24, 2023 ... In this video I use a couple work arounds to get a triple display set up for my new M1 MacBook Air M1. this will allow you to use any old ...As explained in their website: You run the software on each Mac, and it extends the screen over the Network. A Video Capture Card, would let you grab the video output from the Macbook and display it on the iMac. Depending on the software some may let you extend the screen while other's may simply mirror it.will a an older iMac running Catalina be able to be used as a second monitor using a Macbook pro running Big Sur be hello I bought a new macbook pro M1 and would like to use my iMac as a second screen. The iMac is running Catalina 10.15.7. iMac as a second monitor Can I use a 2010 21.5in iMac running High Sierra 10.13.6 as a second …It will just be boot up the OS and I won't use it since it is not functioning, so I would like to find a way to somehow just use it as an external display but without having the processor and RAM all be consuming power. (a partial solution might be to turn on the iMac while pressing the Option key, so that it will let me choose the OS to boot ...Press the “Command and F2” or “Command, Fn, and F2” keys on the keyboard connected to iMac for manual activation. This shall also disable all the keyboard keys except command, F2, Fn, Volume, and brightness control keys. If you cannot successfully connect your PC and iMac, you need to make a few other checks..