Could be the power supply or motherboard. That's a pretty old board; anything over 5 years is subject to fail at any time. Same for most power supplies. 3b tech has several socket a boards for $18-25. Check the form factor for your case. Many are micro atx only. Your board has a via chipset. I have done business with this company before, including one warranty rma. Checkout the asus a7v-266 mx if you are comfortable changing out a motherboard.