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My computer reboots without warning at different intervals

\015 I will be on my computer sometimes just an hour .. other times 24 hrs or 36 hrs .. and then without warning the computer will just reboot. Sometimes my UPS (Power bar thiny) will beep but other times nothing. The computer gives me no clue that it will reboot. Next thing I know my monitor shuts off and then my computer is rebooting. Computer doesn't beep itself when this happens so nothing to go by. No errors neither. It is simply like loss of power.\015

Answers :

This problem occurs if your computers cooling is not as its necessary to be.try useing it with an open cabinet and see if the problem persists. if the problem still persists remve ur CPU fan and place some heat sink fluid and place it back on the cpu. then all your problems should be gone.
use a good antivirus to check for any viruses before this(just in case)

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