This has now become a three day headache starting with a bad mobo. I replaced it with an ASUS P5N32-SLI REV. 1.02 with an intel Pentium D. The computer starts when its plugged in automatically without pressing the button it runs for 30 seconds then shuts off with no output to the display or beeps. Ive checked for wires behind the mobo, tried booting with one stick of ram, reseated the ram and cpu, made sure the power connectors are fully and firmly seated. I just cant figure out why this is happening. any suggestions will be appreciated.