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Computer Switching Itself Off

Old 22nd July 2012 | 18:57
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Computer Switching Itself Off

Last night, I went out, left computer running- got home three hours later, to find that it had switched itself off. Switched back on, and it remained on overnight, (as usual- I leave my computer on most of the time). Everything fine for morning and early afternoon, other than Firefox switching itself off a couple of times by itself (just upgraded to v14.0.1). Same with Outlook- it switched itself off whist I was in the middle of composing an email. Went out for a couple of hours at 3.00 pm- computer switched itself off again. After a few abortive attempts, (with momentary blue sceen verbage, after which an auto shut-down again), I am now back up and running. Prior to last shut-down, I ran MalwareBytes, computer was clean.

But I don’t know why this is suddenly happening, after over a year with no problems, since I last carried out a re-install. I know that that would fix the problem, but I want to wait for Win 8 in a few months time, before I do the next reinstall.

Anyone got any thoughts? Any advice welcomed.

Last edited by Tosh McCaber; 22nd July 2012 at 19:02.
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Old 22nd July 2012 | 19:06
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Check Event viewer, run diagnostics on hard disk for a start.

SD
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Old 22nd July 2012 | 19:36
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Also check for dust & fluff inside and around psu fan.
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Old 22nd July 2012 | 19:40
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Possible mains power cut? Happens quite frequently to us out here in the sticks.
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Old 22nd July 2012 | 19:44
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Download 'Speedfan' and see if you're computer is running at too high a temperature
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Old 22nd July 2012 | 19:48
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From: .
overheating
or failing motherboard

what make /model of machine?
which motherboard?

Last edited by Milo Minderbinder; 22nd July 2012 at 19:49.
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