Right Click on the Desktop

Up will pop a window entitled Display Properties

Investigate the Tab entitled Screensaver and also the button entitled Power

Bobcolby

From your description, it could be anything but the first thing I would check is that all of the fans re running. Also, check the event log to see if there are any clues there.

Open a command prompt and run 'chkdsk /f' which should correct any disk errors. The problem could be caused by the disk, but unscheduled switch offs will create the odd error.

Does the machine just switch off or go to a blue screen?

Had the same problem a while ago, BobC.
If the fan on the main processor has packed up, the processor will overheat very quickly & shut itself down & reboot. Fans readily available from Maplins.

Exec, Optimist

It does not stay on long enough to do any checks. It is probably a power supply problem which is causing overheating and switch off.

I am going to try changing PSU with one in an old computer at least it should eliminate a few causes

Tks very much

Tks HARRYCAT

Fan on processor is working fine. Not too sure about the one in the PSU

Bobcolby

Changing the PSU is a good idea. Does the machine stay on long enough to fully boot? I've known machines that shutdown during the initial checks because they couldn't cope with anything being pluged into the serial/USB ports.

Optimist

Yes fully boots and updates avg then cuts out

Bobcolby

If you hav a spare PSU, try that. It may also be worth swaping memory around to see if that is the cause.

It might be the hard drive but Ii think that is less likely. You could eliminate that by booting the machine from a live Linux CD.

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Tks for yr assistance guys

I think problem was almost certainly processor fan after all.

It was stuffed with dust. After cleaning the pc ran for an hour or so without problems. I then switched it off, put covers back on etc. told my wife it was ok and five mins later it was off again. Then changed the fan with a bigger one from my spare, left cover off and it seems ok again

Tks for yr assistance guys

I think problem was almost certainly processor fan after all.

It was stuffed with dust. After cleaning the pc ran for an hour or so without problems. I then switched it off, put covers back on etc. told my wife it was ok and five mins later it was off again. Then changed the fan with a bigger one from my spare, left cover off and it seems ok again

Excuse the stutter :-(

I can't remember exactly, but I seem to remember that processor fans are rated, so a fan that runs too fast will affect the processor function (i.e too cool). Might be worth checking that the replacement fan runs at the correct speed.

If you have too much cooling, it may well be to noisy and could possibly use too much power but no way is overcooling going to upset the computer.

I stand corrected. Thanks.
Slow fan, unacceptable, rapid fan acceptable.

Can't post an answer on the Bugs thread, Is anyone else having this trouble please?

PC still working fine. Guess it was definitely the fan overheating :-)

Keep getting this "DB Error: connect failed" when going between threads again..any ideas anyone?

.