processor: AMD X2 4400
mobo: ASUS a8n-SLI premium socket 939 ATX
vid: GeForce 7600GT 256mb PCI Express x16
power supply: Antec TruePowerII 430w
ram: 2gb (2 x 1 DDR 4000 PC 3200
hd: hitachi 250gb 7200 SATA
dvd: pioneer 16x dvd burner
heatsink: thermal cl-p0257 blue orb II
case: Thermaltake ATX mid tower
I placed power supply in the case, the motherboard in the case, the cpu (lifted lever, placed it in with no forced required, held it with finger and closed latch), the heatsink over cpu, ram modules (one in A1, one in B1 as directed by motherboard manual), vid card into the first pci express slot, placed dvd and hd into bays but did not connect them to power supply or motherboard yet. Connected heatsink to motherboard as well as the power supply via the 4pin and 20-24pin connectors.
When I turn on the switch on the back of the power supply, there is a solid greenlight on my motherboard. However, when I press the power button on the front of the case - a blue light (power button) goes on for a bref second and then shuts off. When this occurs: My power supply, Heatsink, and Case's fans all turn on for a second and then shutoff as well. I checked all cables and re-installed the cpu/heatsink with no luck.
Is my power supply the likely culprit or motherboard? I can go to circuit city tomorrow morning and grab a new power supply.