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Computer turns on for a split second then turns off


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#1 Pyro636

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Posted 27 September 2009 - 02:11 PM

Hey,

I custom built my own desktop about two years ago and just recently (I'd say like last week) I started having this problem of my computer turning off as soon as it turns on. After it turns on, I can get nothing out of it unless I flip the psu switch off for a few seconds and then back on again. And when I say it turns, on I mean the case fans start to spin, their led's come on, the processor fan and graphics card fan turn on, and the psu led's and fans comes on. I've tested the psu using a paper clip to the green and black wires and it turns on and stays on so I don't think its the psu. Any suggestions? I figure I will have to take everything out and put it back in, and if this is your answer to my question could you please tell me in which basic order I should put stuff back in and whatnot?


Thanks!

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#2 garmanma

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Posted 27 September 2009 - 04:32 PM

First remove only the CPU and turn it on. If it remains running, the processor is bad
Check the bottom of the chip for hot spots
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#3 Pyro636

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Posted 29 September 2009 - 09:09 PM

Took the CPU out, the only power cable plugged in now is the big one that connects to the mother board, still no dice. CPU doesn't look damaged or anything...does this indicate a fried MOBO?

Edited by Pyro636, 29 September 2009 - 09:10 PM.


#4 windowstech

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Posted 29 September 2009 - 09:18 PM

The PSU or motherboard may be bad. If you have another PSU, try it. Or try your current PSU in another computer.
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#5 ProgressiveComputing

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Posted 30 September 2009 - 05:20 AM

I agree with windowstech, Sound more than likely like a damaged motherboard or psu, Have you not got a proper PSU tester? if not maybe a good idea to get one for just a few pounds from places like ebay. Or just try your PSU on another computer, But sounds like motherboard

Tom - Progressive Computing

#6 Pyro636

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Posted 30 September 2009 - 01:44 PM

I agree with windowstech, Sound more than likely like a damaged motherboard or psu, Have you not got a proper PSU tester? if not maybe a good idea to get one for just a few pounds from places like ebay. Or just try your PSU on another computer, But sounds like motherboard

Tom - Progressive Computing



What would be the difference in getting a proper PSU tester?


EDIT:

Plugged in only the motherboard power and bridged the two power switch pins with a screwdriver, PSU turns on and stays on so I'm fairly certain this is not the problem. Unfortunately part of the mount for my CPU heat sink broke and so I'm afraid to turn on any power with the CPU until I have another heat sink in place...


In the meantime, what else can I do to test to see maybe if the mobo is the problem?

Edited by Pyro636, 30 September 2009 - 04:39 PM.


#7 Pyro636

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Posted 07 October 2009 - 03:55 PM

Still looking for help in troubleshooting my mobo...




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