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Computer Wont Switch On - How To Identify Fault?

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#1 etheesdad


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Posted 24 February 2008 - 09:15 PM

I built a pc 6 months ago and it has been running fine. a few nights ago i left it on to find, in the morning, the power light flashing and the hd light flashing but no video, no os, nothing. I unpowered it and later when I went to switch it on, nothing. No power. no fans. no lights. dead.

The parts are all still under warranty. can anyone tell me how to go about identifying which part is at fault? I assume its the power supply or the motherboard, but dont know how to do the diagnostics. I would be enormously grateful to anyone who can set me in the right direction so I can identify whats causing the fault and get it replaced under warranty.

Thanks to anyone who can contribute

Edited by etheesdad, 24 February 2008 - 09:15 PM.

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#2 Sneakycyber


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Posted 25 February 2008 - 06:02 AM

I would start with the power switch. Remove the wires coming from the case switch at the motherboard and try using a small screwdriver to short the two pins and see if the computer comes on. Next check the power supply by removing the main harness from the motherboard and short the green wire to any of the black wires using a paper clip or a small piece of wire. The power supply should turn on. If it turns on I would suspect a motherboard. If you have access to a voltmeter you can check the voltages using this guide. If the voltages are incorrect or the power supply does not turn on I would send that in first. There is a possibility that the computer overheated but it should have turned itself off before any damage occurred.

Edited by Sneakycyber, 25 February 2008 - 06:03 AM.

Chad Mockensturm 
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Certified CompTia Network +, A +

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