Hi

Some more info on your Motherboard ---

Asus A8N32-SLI Deluxe A64-939 Motherboard | silentpcreview.com

ASUS A8N32-SLI Deluxe — a Motherboard on the Top Gaming Chipset (NVIDIA nForce4 SLI X16)

500w and up seem to be fine with this Motherboard, if your PSU was new please make sure to file a claim via its guarantee

Cat