My IMac shuts off in the middle of an application. How can I prevent this?

Frequently, when I am using my IMAC, the machine suddenly shuts down and then restarts. It is very frustrating and I have lost unsaved work on many occasions. Has anyone else run into the same problem and if so, how do I prevent it from happening in the future?

You are going to have to provide more information...
The only time I ever encountered this was when I went to do a service call on someone with a loose connection on the plug right in the back of his iMac. Not every time but often when he wiggled the screen to adjust it he moved the power bar and / or power cable just enough to momentarily break contact.
We plugged everything in securely and the problem never recurred...
If yours is shutting down & restarting because of a power circuit fault there must be a problem with it that should be looked at.
M

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Yvan KOENIG (VALLAURIS, France) dimanche 22 janvier 2012
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My IMac shuts off in the middle of an application. How can I prevent this?

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