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IMac randomly shuts down after Leopard Upgrade

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My wife's iMac randomly shuts down since we installed Leopard. It wasn't doing this before the Leopard upgrade.
It takes about 5 mins. of inactivity after the machine enters sleep mode, then it shuts down. We've searched the Discussions but have yet to see an answer to our question. Nothing but an iSight is plugged in to the machine. Any suggestions?

Answers

Same problem with random shut downs that get more and more frequent making the computer unusable. Took to Apple Store where they did not recognise the problem - tried replacing RAM then power cable then power supply. Said problem was fixed but started to recur within a short time of using it back home. Used install discs to reinstall the original operating system (Mac OS X 10.5.2) and the problem resolved - on upgrading to Mac OS X 10.5.8 the problem immediately recurred. Have gone back to 10.5.2 now and all seems okay.
Seems strange that there are so many postings about this and Apple Store (Genius staffseem to be unaware of it as a problem).
Kim56
iMac 8.1

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