Use my Imac as a PC monitor

Hi,
I would like to be able to use my 27 inch mac screen as a PC monitor for my gaming PC. The graphics card in the imac just cant cut the latest games on bootcamp.
I have the mid 2010 i3 3.2 27 inch imac. I know it can be done but i am not sure which cable i will need and if i need to invoke "target mode" or if it turns on automatically.
Thanks

To use an iMac (27-inch, Mid 2010) or iMac (27-inch, Late 2009) in Target Display mode with another computer as the source:
Make sure both computers are turned on and awake.
Connect a male-to-male Mini DisplayPort cable to the Mini DisplayPort on each computer. The 27-inch iMac will enter Target Display mode and display content from the source computer.
Note: If you are connecting two 27-inch iMacs, connect a Mini DisplayPort cable to each computer and press Command + F2 on the 27-inch iMac keyboard that you will use as an external display.
To leave Target Display mode, press Command + F2 on the keyboard of the 27-inch iMac that is in Target Display mode. To return to Target Display mode, press Command + F2 again.
What is Target Display mode?
Stefan

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Take a look at this article as it explains it in detail pretty well http://support.apple.com/kb/PH4469
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Not going to work, the ONLY 2009 / 2010 iMacs that supported Target Display Mode were the 27" models, 21.5" models simply will not work. Please read Apple FAQ on TDM and you will see I am correct.
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BTW: This is my first post, so it's probably horrible.

Hello Nick, A a warm welcome.. great 1st post too!
I'm afraid using the iMac for a PC Monitor is out, unless it might be a newer PC that has a thunderbolt prt & can output Video through TB port. 2009/2010 iMacs can use MDP. But 21.5" iMacs work as well as the 27" ones for either method.
Not sure DVI or even DisplayPort converters work though.
Here's how it's supposed to work...
http://support.apple.com/kb/HT3924
Mid 2011s & up need Thunderbolt!
http://support.apple.com/kb/TS3775
Are 8GB of RAM really necessary for Xcode, and is the quad-core CPU of the iMac needed?
Well, problem is twofold, 4 GB is barely enough for the OS & one App, & you can't really upgrade the RAM yourself later.
I'd go for the Quad core, computers always get slower over time!
Might be some 209/2010 options here...
http://www.powermax.com/parts/code/PM_CU_IM_I1
http://www.powermax.com/parts/code/PM_CU_IM_I8

Use my Imac as a PC monitor

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