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Dell Dimension PC powers up, then dies, power button flashes

by Scotts87LX / December 4, 2008 1:39 PM PST

I have a Dell Dimension 8400 PC. I recently had some trouble with some spyware and viruses, but with the help of a great forum, I was able to clean it up and it has been running literally like it did when it was new for a couple of months since. A couple of nights ago, it just quit, all of the sudden. Just shut down like the plug had been pulled. I noticed the power button was flashing yellow. I pushed the power button, but nothing happened. I HELD the power button and the yellow light stopped flashing. I was then able to reboot normally.

After a few minutes it quit again. Once again, I held the power button until the yellow light stopped flashing and again was able to reboot normally. This time it ran fine the rest of the evening.

Then, last night, it had been on uninterupted since the night before, but after trying to watch a DVD, it quit again. This time when it rebooted, it quit after a few minutes, and then after another reboot it ran less time, and then finally, it wouldn't even completely boot up before quitting.

I let it sit overnight and tonight I booted it up again and it ran fine for about 5 minutes but once again quit and with each reboot ran less and less time.

Is the power unit in the cabinett going bad? What could be causing this? When it does boot up fully, everything seems completely normal until without warning it just QUITS, like you unplugged it.

Any help would be appreciated.


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I would start
by lacsr / December 4, 2008 8:28 PM PST
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by Scotts87LX / December 4, 2008 11:17 PM PST
In reply to: I would start

Thank you very much. I spend nearly an hour last night on the Dell support site trying to find that information with no luck. Thank you very much. I am typing this reply on the the Dell computer I posted about. Thank goodness for laptops or I wouldn't have been able to post here last night. Thanks again and I think that link enabled me to fix the problem.


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Check out
by Willy / December 4, 2008 11:46 PM PST

I suggest you open case and clean&blow out the dust bunnies. Pay attention to the cpu fan area and brush it out, etc. Once done close case and try a power-ON. if it works as it should you had a cooling issue. If not, remove side cover to system and then power-ON. If it working, you have a touchy cooling issue. Check that ALL fans are working. If it happens again, see the back side your psu *may* have a row of LEDs flashing/lit suggesting a problem issue, note them down. Also, is the psu fan working? If not, then the psu is failing even if you replace the fan, the damage is done it won't last long, replace psu. Of course, if you still have warranty, use it.

tada -----Willy Happy

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