Hey I just got a ga-ma770-ud3 and a phenom II x6 1055T.
WHen i start up the system with any sort of usb connected it just hangs at the gigabyte splash screen. When no USB is connected it will get past the splash screen and start to load windows. As soon as the windows loading.. comes up it BSOD's. When i start the windows installer from the install disk it does the same once it loads up the installer.
I can get into BSOD with no USB's attached.
I think it is because the CPU is only supported on the latest BIOS. Now.. I can only up date the bios using a floppy disk as i can't get into bios with usbs. I have only one floppy drive and i'm not sure if it works. I format it as FAT, put the bios files on, select it in Q-Flash and it says disk error.