forumname wrote:
If your computer is shutting off or rebooting, it is because of heat.
Many (especially newer) computers have settings to shut the machine down when the processor reaches a temperature of (xx).
If the ENTIRE machine is shutting off, its from the processor. If just your VIDEO shuts down (ie computer is still running, but monitor goes blank) then your video card is overheating, and probably fried.
Try opening the case, and looking at the processor. If the heat sink is slam full of dust, then the "fins" cannot do their job, and no amount of "fan" will help until the dust is removed.
I highly recommend NOT removing anything unless you absolutely know what you are doing, and have the thermal compound on hand to reapply if the sink should come loose from the processor during cleaning.
Stick with compressed air to remove the dust, again, unless you feel qualified to remove and reassemble everything PROPERLY.
THIS.
If you have pets and or smokers it can make it need cleaning much more often. I have to do mine once every 3-6 months because i have both.

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