I want to connect iMac 27 (812) as an external display for my PC (video card NVIDIA Quadro 4000) which has 1 DVi and two DisplayPort. I Plugged DVI to my PC and to adapter (DVI to Thunderbolt). Thunderbolt defenetly to iMac. Nothing happened it doesn't work. Command + F2 do nothing. What options and solutions do I have? NO MINIDISPLAYPORT!