Edit : just figured it out, see reply Hi, I just got my new 27" iMac, and wanted to install Windows 7 64 bit via Boot Camp. The installation went fine, but now when the iMac restarts, after the Windows loading screen, I just get a black screen, no display. Windows works, I was able to use it in VMware. I read here and there that there were problems with the ATI card in Windows 7, so I tried to install the Boot Camp drivers in VMware, even the ATI Catalyst ones. Even after that, no display in Windows. I read that someone here used a external display to make windows work at first. Do you think there is an other solution? Thanks a lot.