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Computer powering off by itself

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:) For no apparent reason my computer is powering off all be itself typically at the most inconvenient times (e.g. burning disks), but also at random intervals.

After it does so it will somehow repeat this a few times upon trying to reboot.

This is a recent phenomena and it continues even though I have reformatted my har drive and re-installed my software.

I don't. see any evident problems with ther hardware (fansa re running) and don't believe it has anything to do with overheating anyway.
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    Portlock - Oahu

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How old is the computer? It could be power related, heat, bad motherboard (power circuits caps blown).

Normally, if the computer just shuts down, it's either heat or power.

What are the computer specs? If it's an OEM computer (dell, hp, etc), what's the full model number?
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Ok, well there are two possible problems -
A faulty power supply
A faulty fan.
A faulty power supply could cause problems like automatically rebooting.
A fan could cause the computer to overheat and shut down. I need you to feel the back of the computer and feel if there is a lot of heat coming out of the back. If so, try and replace the fan.
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