Gateway power-up POST problem

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Stachey

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Dec 13, 2011
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My wife's Gateway GM5643e desktop stopped working yesterday, unexpectedly. She was working in the Vista Media Center and it froze up with a black screen (which happens every now and then with her Media Center). Our normal fix is to shut the computer off with the front power button, wait a few minutes, and start back up again. When she hit the power button to shut down she said that she got a bunch of colored bands across the bottom of the monitor, something that's never happened before. After a few minutes she went to start it up and the computer didn't want to.

When the front power switch is pushed, the PSU fan, the CPU fan and the case fan power for about a second, maybe less, then they all shut down. About 6.3 seconds later, they all try to start again but shut down immediately. This cycles on until I pull the power cord out of the PSU (the front switch doesn't stop the process). After I plug in the PSU again, nothing happens (green light on the MB, but that's it) until I press the front power switch. Then the cycling starts again.

My thinking is that there is a signal being sent to the PSU that there is an overload or overheat condition and to shut down. I've taken all the power cords off of the components; HD, DVD drive, card reader but the cycling persists. I've taken the PSU out of the computer, removed any dust in the system, reseated the four memory cards, reseated the TV card. Same result. I haven't taken the heatsink off of the CPU. If it was an overheating issue, at least the CPU has to boot up to start to get hot.

I don't know what the components of the POST (Power On Self Test) are, but apparently we're failing on Question #1, whatever that is. I've tried to test the PSU but without a switch on the back I don't know how to activate it. Shorting out pins 14 with a ground doesn't do anything. With the power cord out I get residual voltage through 14 but it seems that that comes from pin 9, the +5 v standby.

I'm stumped. Any ideas?
 
Joined
Jul 19, 2005
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I would start troubleshooting by jumping a known good power supply to the board to see if the problem continues. If you don't have a known good power supply to use, take the tower to a shop where they can test the existing power supply with a PSU tester and also can jump the board with a known good power supply.

I test power supplies and boards like this all the time and it takes about 20 minutes so the cost should be minimal around $25-$30.
 

Stachey

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Dec 13, 2011
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3
Thanks for the advice. I had exhausted all of my simple tests, took it to one of the few shops still open in my area. We'll see.
 

Stachey

Thread Starter
Joined
Dec 13, 2011
Messages
3
Resolved.
The power supply was good but the motherboard had developed a short in it, so replacing the MoBo.

Thanks again for the suggestion.
 
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