On my iMac I am getting the same problems... Vista x64 I get through the whole install to desktop and upon reboot I go straight to a black screen with a blinking cursor. With Windows 7 x64 I get to the finalization screen after network settings and reboots and to the same black screen with blinking cursor. Neither boot gets to a Windows loading screen. If a Windows Install disk is left in the ROM it will hang on Press Any Key to Boot.... Any ideas? I tried reseting PRAM and no luck. I have installed and removed Windows so many times today. I just simply wanna play a few games in Windows is all.