Okay I did not believe this at first. http://support.apple.com/kb/TS3775 It seems that Apple has taken a huge step backwards with the 2011 iMacs. Another user has reported this. I for one use Target mode alot with my current setup, MBA, 2010 MBP and a PC with miniDP out. Now your need a TB connection to TB connection. So nothing other then a new MBP can be plugged into an iMac. Does anyone else use Target mode currently or rely on it? For me this is a huge stepbackwards and means I will not be buying a iMac in the future unless I upgrade all my other mac laptops and can find a PC card that supports TB. Very disapointed when apple pulls this crap. I love the Target mode feature on my current iMac, its a huge selling point.