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Computer Shuts Off Half A Second After Turning On

post #1 of 15
Thread Starter 
My dad's computer, a relatively old custom built rig on intel 775 socket, randomly completely shut down one day after working fine for several years. When I turn the switch on the power supply on, the red light on the motherboard comes on, but when I try to turn the machine on, the fans start spinning for about half a second and then it shuts down. The power indicator light on the case starts flashing after this happens. I assume this is most likely a motherboard or PSU error, thoughts?
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post #2 of 15
Hmm.. sounds to me like it might be the PSU.. When my PSU died it did what sounds like yours is doing.
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post #3 of 15
Either Motherboard or PSU as you said. Try to replace them one by one to determine which one is faulty.
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post #4 of 15
Not to make a flame, but if it's a Dell, its most likely the PSU. My storage server is a Dell Gx270, and this is the 3rd power supply i'm on because of Dell failure. I'd get a different brand PSU if possible, but dell's proprietary size PSU for my server is keeping me from it.

As for the flashing lights, they're for diagnostics. If you have the manual, or search google, you can find what the lights mean.
post #5 of 15
I had a dell that was a socket 775 and it was doing the same thing. This was in a educational computer lab I was working for. I switched out the processor and it worked fine, so dont rule out your processor quite yet.
    
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post #6 of 15
Thread Starter 
it's not a dell, it's a custom built. the flashing light is just on-off-on-off at a constant rate for as long as the power supply is flipped on, like the computer thinks it's in standby/sleep mode or something.
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Gaming Rig
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i5 2500k @ 5.2ghz 1.43v Asus P8P67 Deluxe Asus + MSI GTX470 SLI - 885/1770/1800@1.1v 3x2gb Corsair Dominator DDR3 1600 
Hard DriveOptical DriveOSMonitor
1TB + 500GB Seagates, 80gb Intel X25-M SSD LG 22x CD/DVD Reader/Writer Win7 Home Premium x64 24" 1920x1200 Samsung 
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Logitech G15 XFX 850w Black Edition Coolermaster HAF932 Logitech G500 
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post #7 of 15
replace the the power supply with another one and see if that fixes it.
post #8 of 15
What made anyone assume it was Dell? pretty random assumption that.

Get a hold of a copy of the mobo manual and check to see about post codes/flashes/beeps to see if you can make any sense of it.

I assume you have reset cmos? yes?
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post #9 of 15
Motherboard?
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post #10 of 15
Make sure the switch on the back of the PSU is turned to to the lower number (115 I think? NOT 230). This has happened to me in the past. Also, obviously, make sure the PSU is turned on. They store a tiny bit of power after shutting down, and this might be enough to power up the PC partially. As a final thought, it could be the PSU dying. I'm not sure of XFX's PSU quality, but if you've tried everything, replace the PSU.
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