Not to try and revive a "dead" thread... but my other computer has the same issue... except I can't even get Windows 7 to load.
Setup: GIGABYTE GA-MA790XT-UD4P AM3 DDR3 AMD 790X ATX AMD Motherboard SAPPHIRE Vapor-X Radeon HD 4870 2GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported CORSAIR CMPSU-850TX 850W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready Active PFC Power Suppy AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor Model HDZ955FBGIBOX CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Triple Channel Kit Desktop Memory Model TR3X6G1333C9 Creative Sound Blaster X-Fi XtremeGamer 7.1 Channels 24-bit 96KHz PCI Interface Sound Card Linksys Wireless-N PCI Adapter With Dual-Band WMP600N Network adapter - PCI
To install Windows 7, I had to do a clean install and remove the ATI vid card and replaced with NVIDIA 8800 GTX Ultra I had laying around.
I tried to re-install the card after Windows 7 was installed and I ran into the same problem:
The Windows 7 logo appears on the screen and starts to load windows... a second later the screen goes black and the monitor goes into "No input mode" and nothing else happens. I hard reset and it keeps happening over and over.
I think Dave76 may have mentioned it having to do with the rig having 4 gigs of RAM and 2 gigs on a video card on a 32bit system.
However, my other computer also has 4 gigs of RAM and the SAME vid card (just the X2 version that is stated as being supported on Microsofts webpage) and it runs just fine on a 32bit install.