My homebuilt PC died last night after running fine for several months in its current configuration.
My external USB HD (MyBook) was acting up so I unplugged it and rebooted. When Windows started again I plugged the drive in, it initialized, and then the PC rebooted. It didn't POST however and the case HD light was steady on. I tried resetting via the case, same result. I unplugged the power, waited, plugged back in and got nothing at all when I tried the case switch. The motherboard status light is lit, however.
I've since removed all cards, memory, etc. and reseated everything, still nothing. I've also removed the CMOS battery, waited, reinserted, still nothing. I've replaced the CMOS battery with a fresh one, still nothing.
I'm suspecting the power supply (I'm about to try it in a different machine), but could it be anything else?
Mobo: ASUS P5L-MX
CPU: Intel C2D E6300
RAM: Corsair XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 675 (PC2 5400)
PSU: Coolmax AP-550X (CP-500B)
1 SATA HD, 1 IDE HD, and 1 IDE DVD-RW also typically connected