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Computer Shuts Down

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My computer shuts down completely at random. When I turn it back on manually, nothing different happens than if I had shut down the computer myself. I'm not getting any error messages or anything and I've tried to identify something that I'm always doing on my computer when it shuts down on it's own (a common variable), but it seems to be totally random. Also, my computer has randomly shut down while I've been in another room, so it can't be a button I'm pushing. What is wrong with my computer and how can I stop it from shutting off at random?

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Bad computer memory is one of the three main reasons for random system failures.. the other two are heat (usually caused by fans or heatsinks being blocked with dust) or power issues...
first...unplug case from the wall...open it up and clean out all the dust bunnies...be sure to clean the cpu heatsink fins up real good.....guide is here..

then lets make sure its not your memory going bad...get memtest + here....
the lowdown is here..

if you have a floppy drive you can get the 6th one down ...set the bios to boot from the floppy drive A:

first...then the cd drive then the Hard drive C:
or you can get the 2nd one down and burn the ISO file to a cd and then boot it from the cd drive...

if you don't have a burning program that will burn .ISO files go here and get burncdcc ..a small FAST no frills iso burning program...

NOTE...do not put a blank cd in until burncdcc opens the tray for you
1. click on BurnCDCC.exe
2. Browse to the ISO file you want to burn on cd/dvd ....in this case its memtest86.iso
3. Select the ISO file
4. click on Start

make sure in the bios the cd drive is the first boot device....put the cd in the cd drive..boot your computer....
let memtest run for at least 2 hours...if it starts showing any errors during that time then you will have to replace the RAM...no errors after 2 hours just press Esc to end the tests and we will try some other tests

go here and get everest home...install and launch it...click the + by computer...click on sensor...get a screenshot and post it so I can check your temps and voltages...
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I have the same problem, for no reason what so ever the computer just shuts down. It just came out of the shop to be updated cleaned etc. I ran Diskeeper and everything looks good. I tried looking for everest home and cant find it on the link you put on. The fan is loud and have cleaned it out but will get some canned air and try again. Any other suggestions.
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