I just built my system and I am having problems with the screen resolution. The system boots up fine, but the screen resolution will not go above 640x480 and 4bit color (the option in settings is not even there). I tried a 2nd monitor and get the same problem. Everything is new except for the monitor. Could my power supply not be sufficient? Driver problem? Any help is greatly appreciated.
Have you installed the latest drivers from nVidia? I recommend using drivercleaner to remove those bad drivers. Download the latest drivers for the 8800GT. Then download the drivers for your monitor (not really needed, but every little bit helps).
also make sure your motherboard drivers are up to date, as well as the BIOS.
Edit, What OS are you using? Also what power supply?
I uninstalled all graphics and monitor drivers in device manager, shut down the system and restarted with the Nvidia disk in. Everything loaded, pnp monitor driver loaded and resolution was fine, but several minutes later the screened went black and came back on with the old 640x480 4bit?