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Computer crashes after five minutes

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My comuter boots up fine but after 5 mins it simply crashes my screen says no signal and light is on in the system button but everything just stops ...need to turn off power at mains and reboot after 5 mins same thing... I last night tried to install windows thinking it to be a windows /virus/spyware problem ...put cd in it was working but 5 mins my system crashed again. I have no idea what could be the problem...It used to happen before but till a couple of days ago turning main off and on again would do the trick but not now...Pls help

I have left my computer off for hours and it is cold weather in melbourne, so temp ...no way.
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    Mechanised Mod

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Hi zeke77 :)
Strong possibility that the psu was & has now failed, but there
could also be other reasons, have you ever cleaned out the inside
of the computer case including all fans, dust is a major cause of
overheating, whilst the side is off the case you should power up &
make sure that all fans are working correctly especially the cpu
fan, make sure all connections are firmly in place, remove each
memory stick & if you have an add on gfx card remove that, clean out
the slots & replace the cards securely.

I have left my computer off for hours and it is cold weather in melbourne, so temp ...no way.

It takes no time for components to heat up particularly the cpu &
a lot of motherboards have thermal sensors that shut the system down
at high temps to protect the cpu & other components.
Please make sure you take anti static precautions before touching
anything inside the case & make sure the power lead has been removed.
Should none of the above resolve the issue you will need to post as
much information about your system, make, model, motherboard, custom
built or dell, hp etc.
Good luck & let us know how it goes
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