dell computer keeps powering off

hi experts,

 I have a dell computer that keeps powering off and it won't power  backup unless I unplug the power supply from the motherboard for a minute and then it turns back on and stays on for a day and then it powers off again.
frankbustosAsked:
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tailoreddigitalConnect With a Mentor Commented:
Then it's probably a bad motherboard or power supply.

Look for bad capacitors,
Bad Capacitors
For power supply testing this has worked well for me,
http://www.amazon.com/Thermaltake-Automated-Supply-Oversized-Supplies/dp/B005F778JO/ref=sr_1_2?ie=UTF8&qid=1371749534&sr=8-2&keywords=power+supply+tester

Of course if you have spare parts, swapping the a very reliable basic way to test these thing.

Also try running it with the minimum amount of cards and devices.
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tailoreddigitalCommented:
Check to make sure there isn't a bunch of dust caked up inside overheating it.
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frankbustosAuthor Commented:
no dust ta all
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frankbustosAuthor Commented:
I changed the power supply 4 months ago because it was doing the same thing. And now it started soon this again.
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mrbcam21Commented:
Sounds like a PSU issue...any codes via the lights or beeps? I'd hot-swap the PSU first, if not the PSU then the MB.
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tailoreddigitalCommented:
Did you change the PSU with a new one?   Maybe you have bad luck and have two bad PSU.
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frankbustosAuthor Commented:
ok, I changed the power supply and going to give it a day or two and get back to you guys.
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nobusCommented:
is this a pc- or laptop?
you can reset the bios, or update it; that often helps

check also if it is not overheating; install speedfan to monitor the temps :  http://www.almico.com/speedfan.php
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frankbustosAuthor Commented:
thanks, I replaced the power supply and it's been ok since.
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