Re: GeForce 7600 GS power problems...
My last computer fried because I used a PSU that wasn't quite up to the challenge. It's HIGHLY recommended that you get a decent PSU.
HEC Orion's 585-watt is cheap and works for me. My multi-meter says it's stable too. Got mine for $30 on TigerDirect.com. (item# V133-6041)