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It could be lots of things. Here is what I would do:
Open the case and clean out the dust (heat is an enemy of electronics and often causes this sort of problem)
If the vid card uses passive cooling, you'll just see a heatsink. Make sure that is free of dust. If the card uses active cooling, you should verify that the fan operates.
Reseat the card in it's slot. (Card-edge connectors blow)
Verify that the system cooling fans operate
Reassemble and load the latest nVidia video driver from Dell's site.
Download and apply the 'coolbits' Registry hack for nVidia
Do not overclock this card. You'll sacrifice longevity and stability for speed if you do.
Your nVidia control panel should now have a new setting to monitor GPU temperature. For normal web-surfing and such, this should be between 40 and 60c. If it's higher, there is a problem...
uses passive cooling and gas a giant heatsink.
Last edited by StupidlyBrave; 11-24-07 at 11:06 AM.