Computer Shutting Down

[El_Baz]

Periodically my computer shuts down.  Sometimes I can go a month or so, then all of a sudden the machine just quits on me like it has just done. I would welcome any thoughts as to a likely cause.

Could the fact that I run my machine for lengthy periods have anything do with the issue. The machine as been running for four hours before it switched itself off this morning.

It's damned annoying when I'm busy working on an image in Photoshop.

I've checked power cables, both at the wall and the power supply socket.

May thanks.

[SuperDave]

You can check your fan speeds and also your computer's temperatures by downloading and running Speedfan

[patio]

Sounds to me like an old tired PSU...swap a known good one in there for a week if you can borrow one.

But as Dave suggested above also check yer temps...

[El_Baz]

Thanks both of you, just one question about Speed Fan, is there anyway of starting this on start-up?

[SuperDave]

There's no real advantage to having it run at start-up. You need to wait until the heat builds up but you should be able to set it to run at start-up.

[El_Baz]

Thanks for to those who replied.