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Computer turns on for 1 second and the off.

Last response: in Motherboards
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February 23, 2014 5:23:06 AM

My brothers computer will start the fans and the lights on the front of the case will come on but then turns off. It'll then repeat this process unless you unplug the psu. The power button won't stop the cycle. I then took all of the non-essential components out and left just the cpu in and still does the same thing. Also tried with just the CPU and ram. I tried all of his components with my computer and they work fine. Then I tried booting his with my PSU, and had the same results as when using his PSU. While working on it, I noticed his heat sink was so full of dust, I don't know how much heat was really being exhausted. I was wondering if it is the motherboard failing or possibly the CPU was burned up since it might not have been getting rid of the heat, or something else entirely.

Here are just a few specs that I can remember about it.

HP desktop
AMD Phenom X4
4 x 2gb RAM
300 Watt PSU
On Board video ( no discret video card)

Sorry for not being more specific but I don't currently have the computer.

More about : computer turns

a c 1152 V Motherboard
February 23, 2014 7:02:23 AM

Most likely the motherboard failed, check for any bulging/leaking capacitors.
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February 23, 2014 11:03:27 AM

I looked and I didn't see any but I also may have just missed it.
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February 23, 2014 2:36:10 PM

I just got the computer back and the capacitors are fine.
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a c 1152 V Motherboard
February 23, 2014 2:38:19 PM

Now working?
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February 23, 2014 10:33:38 PM

No, I was just confirming that the capacitors weren't leaking or bulging. It still is doing the same thing. Also, I forgot to mention that I don't receive any beeps before it shuts back down.
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a c 1152 V Motherboard
February 24, 2014 5:00:28 AM

Well you have tried the components and another PSU so it pretty much leaves board and CPU and over 90% of the time between the two it is the board.
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February 24, 2014 5:42:36 AM

Guess its time to get the board then. Even if I get the board and that doesn't end up being the problem, it's not really a huge loss since its a 5 year old stock board from HP anyway. Thanks for the help rolli59. Once I get it fixed, I'll post and let you know.
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February 24, 2014 7:55:12 AM

Well, I tore it back apart and found some new information. I took the cpu out of the socket and I didn't see any burn marks or bent pins, or anything else of the sort. I decided to reset the cmos too just to take out any other random possibilities. Then once again, the computer would start to boot for a second and then shutoff and then start again like it had been. However, this time I noticed that the psu fan would also shut off every time the motherboard did its reset. I then took my known good psu and the same thing would happen. I was wondering if this would more definitively say that the motherboard is shorting out and is the faulty hardware?
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a c 1152 V Motherboard
February 24, 2014 7:59:02 AM

Still points to the board, being a power problem and you have tried two PSU's.
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