running anything higher than 8 bit will cause my system to die off after running some programe which uses higher colour quality. Running the "Test Direct3D" (under Display tab) using the "DirectX Diagnostic Tool" will surely triggle the fault...thereafter my system cant boot up and will need to power off and on my psu for my system to boot up again. It's not a new system is around 14mths old. Mainboard: Gigabyte GA-8S648FX , 800 FSB , DDR 400, USB 2.0 CPU: Intel P4 3.0Ghz 800 FSB (HT) PSU: AC 230 / 50Hz RAM: DDR PC400 256MB Display: NVIDIA GeForce4 MX 440 with AGP8X (128MB) OS: XP Home SP2 Problem Screen Resolutions: 1024x768 32 bit (60Hz refresh) Current Screen Resolutions: 1024x768 8 bit (60Hz refresh) Monitor: Samsung SyncMaster 151s DirectX: 9.0c tried updated my graphic and most drivers but problem still occours. works fine on safe mode & VGA mode (msconfig boot option: /BASEVIDEO) PSU problem? graphic card? or? pls help..thanks!