Is there any way to use a 2011 27" iMac as a PC display? I have two desktops...a recently purchased 27" iMac and a PC desktop. I use the iMac for day to day stuff and want to use the PC for gaming. However, I do not want to have two monitors on my desk, and would love to be able to use the 27" as my monitor for the PC. Is there ANY way to do this?