First thoughts would be that you have a bad vid card.
Esp if the prob is apparent during boot up, before windows loads.
Either that or there is some major hardware conflict going on!
Have you tried it with things at default speeds. CPU, memory cas, lower AGP, etc?
Have you set bios up for the geforce?
Video bios shadow Disabled
System bios cacheable Disabled
Video bios cacheable Disabled
Video ram cacheable Disabled
AGP aperture size 64 or higher
PCI/VGA palette snoop Disabled
Assign IRQ for VGA Enabled

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