Use iMac as external display for Windows PC?

Sorry for the noob question! This support article says you can use the iMac as an external display for Macs, but I want to be able to get rid of my current monitor and hook up my PC.

http://support.apple.com/en-us/HT3924

Is what I'm trying to do possible?

redheeler said:

Seeing as it's pretty much impossible to convert HDMI to Thunderbolt, I suppose that would rule out the 2011 and later iMac. I do know the 27" mid 2010 will work with any Mini DisplayPort signal.

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My graphics card has dual-link DVI, HDMI, and Displayport 1.2. Am I pretty much out of luck with this endeavor?

xraydoc said:

Pre-Thinderbolt iMacs should work with any DisplayPort signal for Target Display Mode.

Post-Thunderbolt iMacs will only do TDM for another Thunderbolt-equipped Mac.

Sorry.

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Thanks guys. No worries. That's Apple for ya!