Power supply cycling quickly and repeatedly

April 18, 2013 at 13:29:54
Specs: Windows 7
Wife's computer is power cycling repeatedly. When it gets turned on, it starts to spin up and then shuts off, then tries again, and shuts off. Over and over in a one second loop. No beeps or any other unusual sounds (grinding fan, etc). Just starts the fans then dies after a second and then tries again.

Thinking it is the power supply as it isn't even on long enough to start anything else. Any thoughts before I open it up when I get home? Gonna blow out the dust, but I suspect it isn't dust (not that old and off the floor) and even if it was dust, I'm thinking damage is done so removing dust likely won't help. The power supply light on the back is green, so in theory it is receiving power.

Any thing else I should consider if it winds up not being the PSU? I think I have a spare PSU, but if that doesn't work I will be at a loss as to what to try next.

Thanks in advance!

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April 18, 2013 at 14:26:39
System specs? What are we working on? Who built it? Exact model number if a manufactured computer like hp, dell, etc.?

Audares Juvo

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April 18, 2013 at 18:47:53
See if you can access BIOS set up. If you can, disable auto restart so you can see errors. Then wait a while and check voltages and temps in BIOS to see if they are within specs. Let it sit a while so you can tell us if it crashes from BIOS or not. All voltages need to be within 5% of their nominal values.
Try running Memtest from a bootable CD you burn from ISO image. Let it run through all tests.
Test the hard drive with hard drive mfg's utility via bootable CD/DOS version, run longest test available.

You have to be a little bit crazy to keep you from going insane.

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