I agree it's a video card driver issue. Did you try the latest Intel.com video driver?
To repeat myself -> No, Windows does not seem to be able to find drivers well. It's been decades and Microsoft appears to not be getting the message about drivers. We are getting a little tired of driver hunts.
Every time I click OK at the Windows 7 UAC pop-up box my Samsung monitor goes very bright and stays bright. The only cure is to restart/reboot. I have switched monitors (Dell) and it too goes very bright after UAC OK. Anyone have a fix? Could this be a driver issue?
SPECS: Dell Vostro 230 Slim Tower, Win7 Home Premium 32-bit, Dell Vostro Integrated Video GMA X4500 Graphics.