Computer shuts down after 2-3 minutes

August 7, 2009 at 04:10:54
Specs: Windows XP Pro SP2
My computer would not start at all, i was advised to put in a new PSU, which i have done.
Now, the computer starts, but the monitor is not showing anything at all. There is one short beep a few seconds after starting. After about 2-3 minutes, the computer turns itself off.

Does anyone have any suggestions, I would very much appreciate any help.

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August 7, 2009 at 04:21:43
One short beep is good, means the POST was completed successfully.

Shutting down soon after starting is not good. Would indicate a possible overheating problem. But that would not stop you getting something on the display.

First I would go into the case and check you havn't dislodged something while installing the power supply, easy done. Reseat the memory and videa card if there is one and anything else that can be reseated and try again. Check he cables to the hard disk and CD/DVD drive. They can look all right but can often be a little lose.

Until you can get something on the display there is not a lot you can do.


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August 7, 2009 at 05:30:12
It's tough to make a diagnosis when you don't list any of your system specs. Some CPUs are more prone to overheating than others...the P4 is one example. When it reaches a certain "trigger temp", it will force a shutdown to prevent a burn out. Since it's happening so quickly, it would seem your CPU heatsink/fan is either totally dust-clogged, the fan isn't working, or the heatsink has come loose from it's mounting.

Another possibility is the PSU you bought isn't up to the task. Once again, it's hard to make a recommendation when no system specs are listed but you *should* have gotten at least a 400W unit with at least 25-30A on a single +12v rail...or if it's a multi +12v rail design, each +12v should have 18-20A. It should be a reputable brand name unit & should have cost roughly $50 +/-. If you based your purchase solely on wattage, didin't pay any attention to amperage specs & paid closer to $20 than $50, it's very possible the PSU is inadequate.

Post your specs!

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August 7, 2009 at 07:39:33
Thanks for the quick replies.

I have tried removing and reconnecting all the cables, also the RAM and graphics card.
The new PSU cost $48, it is 450W 32A. The unit that it replaced was 400W 32A, so it should be fine.

The computer has:
Celeron 2.80GHz CPU
80GB hard disk
DVD RW drive
CD ROM drive
MSI RX9250 graphics card

If you need to know anything else specific, let me know and i'll see if i can find out the details.

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Related Solutions

August 7, 2009 at 12:16:29
Excellent advice above. As Stuart said the single beep indicates that the motherboard and CPU are working ok.
The combination of lack of a display and powering off is kinda strange. That would tend to indicate two problems.
If you have more than one memory stick, try one at a time.

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August 18, 2009 at 19:33:18
You were right, aegis1. There were 2 problems!
The monitor was incorrectly connected, thus it was not displaying anything. My stupid mistake!
Second problem was that the CPU fan was not secured properly, causing overheating and automatic shut down.
Everything is working fine now.
Many thanks to all who responded with suggestions.

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