It has been running for three years - w/o a problem. Now the leds and fans come on but nothing else. No hd activity, keyboard led flash on/off, and monitor stay in sleep mode. Inspected mombrd and vid card for budging caps -- none found. Using SATA drives (2 hd 2 optical), 4GB ram, dual core processor and Vista Ultimate OS.
Could be bad PSU Get out your volt meter.
Checked PSU voltages are correct.