Computer turns on then off after 1 second

December 25, 2010 at 17:01:08
Specs: N/A
I am having a similar issue as to that reported over here:

Computer turns on for maybe one second, then turns off for 2-3 seconds, and then it turns on for another second and so on. This is a custom built computer (not by me) and had been working for a couple of years before this started to happen.

Here are the build parts (I'm doing the best I can by looking):
PSU - 700W Thermalatake toughpower
Memory: 4GB (2x2GB) DDR2 Corsair XMS2
MB: MSI MS-7529
CPU: Unsure as I haven't taken the heatsink off since I don't have any paste that I can put it back on with right now.
There's also a video card in there but I had taken it out for all of my testing.

Here are a couple of things:
There is a 4-pin connector that is close to the cpu from the power-supply (I'm sorry as I don't know what this is called) that if I unplug it, the fans and everything power on and stay powered on but there is no output to my monitor.

If I plug that back in and take out both memory modules, I get the same thing (everything stays powered on but no output to monitor).

I don't really have any parts or anything that I can test with this build so I'm trying to find out what people's thoughts are as to what would be causing this issue based off of what I've stated. Let me know if you need any more information.

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December 25, 2010 at 17:32:53
This is probably a failing power supply. There is a small chance that your CPU is overheating right away due to a clogged heatsink or failed cooling fan, but since you've had the case open already, you probably would have noticed either the fan not spinning or an abundance of dust. Try a different power supply and see if that solves it.

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December 25, 2010 at 18:00:12
The 4-pin plug powers the CPU. The system can't boot without it.

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December 25, 2010 at 18:20:00
Thanks mickliq. I was just posting information about when the error does or doesn't occur. I wasn't expecting the system to boot up without the 4-pin plug connected.

afish01 - I'll see what I can do about getting a psu to test in the system to see if that fixes the problem.

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Related Solutions

January 12, 2011 at 09:37:02
I have the same problem. But it works some times if i wait and move the computer. could it still be the power supply?

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