Using a Mid 2011 iMac as an external display.

Hello, I was wondering if it would be possible to use my Mid 2011 iMac as a external display for a PC.
In the interest of gaming I am looking for a new gaming PC and I would really like to use my iMac as the display because I still want to use the iMac.

Yes, if it's a 27" model.
Target Display Mode 2011 & Later iMacs
iMac- How to use your iMac as a Target Display Mode display

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    Morning seal, my experience suggests the latter of your two posts is the correct one. I have a 27" iMac with a mini display port (a 2-year old one, not the newer one with thunderbolt); and a brand new Mac book air with thunderbolt. I connected the two with a Belkin male-male mini display port to mini display port cable, and it works fine - press command f2, and the iMac acts as display for the MBA.
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    These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
    This procedure is a diagnostic test. It makes no changes to your data.
    Please triple-click anywhere in the line below on this page to select it:
    syslog -k Sender kernel -k Message CSeq 'n Cause: -' | tail | awk '/:/{$4=""; print}' | pbcopy
    Copy the selected text to the Clipboard by pressing the key combination command-C.
    Launch the built-in Terminal application in any of the following ways:
    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
    ☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
    Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
    Wait for a new line ending in a dollar sign ($) to appear below what you entered.
    The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.
    The Terminal window doesn't show the output. Please don't copy anything from there.

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    Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
    Reset the system
    You can reset the Mac's parameter RAM and SMC.
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    Make an appointment at the Genius Bar of an Apple store. It is free.
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