nvidia gtx 660 when enabled computer powers off so restart but same thing happens , plenty of power 650 watts , card ok no llose connections tried adjusting resolution not overheating so what is the problem , windows 7 64 bit ultimate i7 quad 8 gb ram , must be a fix or just 1 solution that fixes this prolem have read about many others with the same fault seen plenty of suggestions but no cure
If the computer worked fine before the 660 and only has the problems after installing the 660, then a few question come up:
Is your power supply capable of delivering the extra power that's demanded by the card? That's why we need to know the make and model of the "650w" PSU. If it's manufactured by duct-tape power inc, you might have a suspect.
Is there some sort of driver issue causing instability at idle? I have never heard of this happening outside of specific driver/game combinations, but it's a possibility.
Is the card itself faulty out of the box? Do you have another PC you could try it in?