I'm trying to figure out if my ASUS a8n SLI deluxe MB is causing a Power Supply shut down. Any advice is most welcome. This is what's going on:

I have a a8n-sli deluxe motherboard and run two evga 7900gtx video cards in sli mode. Recently I had to rma the video cards and a day or two after receipt of the replacements I started to get PSU shutdowns: 2, 3, 5 minutes of up time and then bang, power is off. Thinking it was a problem in the PSU, I pulled out the Seasonic 525W PSU and replaced it with an Enermax 625W. It made no difference. I also shuffled the video cards around, using all 7 possible combinations of cards and positions. The only installation that works is no video cards at all.

When a video card is installed and I boot the system, I get a nvidia system mgr message saying the video card is not getting enough power. The video card has it's own 6 pin power plug in place. Now, a couple minutes later the PSU shuts down but get this: on day 1 of using the replacement cards -- only one installed -- the system ran ok. I also plugged in the suplimental 12V plug into the MB and that made no difference.

Any ideas what's going on here?

Try one card at a time and see if your have any issues.

You can rule out the psu and vid cards, check your mobo for blown caps (however unlikely). Maybe time for an upgrade??

Ahhh... it's not a blown cap but a damaged lead on a cap. It's very close to where the edge of one of the video cards would be... I bet I damaged it when removing that card.

Thanks for the tip.