2012 iMac as external monitor

Hi, got 2012 imac that I want to use as a external monitor from my PC with has displayport out.
From research I see that to use it via HDMI or DVI you have to make sure you get an expensive bi-directional cable, but all the cables I can see are just called mini-displayport to displayport, where as I want to go from displayport to mini-displayport.
Do I need to a different cable or are mini-displayport to displayport cables bi-directional?
Cheers

Hi, I don't think you can do it...
Mid 2011s & up need Thunderbolt cable...
http://support.apple.com/kb/TS3775

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