Problem with radeon 9800np

[Richard Cranium]

Hi all. I'm having a prob with my one year old card.

The picture goes out for extended periods of time.
It's gotten worse since xp sp2 install.

enermax 330w
radeon 9800np
p4 1.8/2.4
1 gb pc2700
120 gb ibm
cdrw
modem

i also have a dvd drive but have had to unhook it as the computer won't boot with it attached after sp2 installed. Do you think the problem is my card or power supply.

I was runnning the card @ 418/318 but backed off since problems got worse.

tia,

RC