My Asus 8800 GTX died this past weekend (October 17th) almost exactly the same way your card did. Dots and streaks during POST and in the BIOS screen. It boots fine in safe mode but BSOD oocurs at winlogon screen with normal boot. Removing the driver allows one normal boot until Win 7 installs a driver for it (automatically, apparently) and crashing returns on subsequent startups. I tried several older Nvidia drivers with no luck. My brother had the exact same card as mine and his died only days before. Yours makes the 4th 8800 GTX I am aware of failing in this manner in the past month or so. Perhaps the 8800 GTX candles are all burning out?