I am a current PC user and I am planing my purchase for my i-7 27" iMac but I have a question regarding the Mini Displayport. I frequently repair PC's and use my display as a second input to connect to the PC that I need to repair. I have been reading the spec on the iMac and noticed that the Mini Displayport can be used as an input. Can someone tell me which adapter that I need to purchase to make this happen? Thanks