Complete Shut-Down

[Allen603]

I have a white iMac 20" which has what seems an unusual problem.

I have a completely standard iMac which for some reason is completely shutting down for now reason at all.

It happens when I switch from one window to another or as it did this morning shut down when using a Hot Corner.

Any suggestions?

Thanks

Allen

 

[spinnerlys]

What Mac OS X version do you have?

Since when do those things happen? Did you install anything lately?
Do you still have Apple Care?

And how often does a shut down happen?

 

[rdowns]

Pulling a diagnosis out of my ass, sounds like either a logic board or power supply issue.