Look In the Bios Screen and Check out the Power Voltage Signals. You want something within .5% of the readings like 12V=11.5-12.5 5V=4.85-5.25 3.3V=3.15-3.45. If Its worse than this range, than the PS is faulty possible. Too Much Juice to start up all components at once. Try Measuring a hard drive-drive or video card to see if power surging meaning unit is defective!