IMac G5 starts up by itself from sleep mode

Hi Guys,
My iMAC G5 suddenly decided to start up by itself from sleep mode. I put it back to sleep and about 1-2 hrs it starts up again. I bought in 10/04. My local Apple dealer wants $75.00 just to look at it and being a 72 yr old senior, it's a bit stiff.
Any suggestions would be greatly appreciated.
chris

OK, if you are sure it is not actually shutting down and restarting (it will do this if you have a defective power supply and "restart automatically after a power failure" enabled in the Energy saver system preferences options), and the problem still occurs with all non Apple USB devices disconnected, then it is probably either a network or a software issue.
Again in the "Energy Saver" Options make sure that "wake for ethernet network administrator access' is turned off.
Now think about any software that may undertake any form of time scheduled activity. Elgato's EyeTV is one example that has sometimes been implicated in this behaviour, but many other things like virus checkers and drive utilities can also be involved. THese sorts of things usually involve components which run in the background even when the primary application itself has been shut down.
You can often get an idea by seeing what is running in the background using "Activity Monitor". Checking your "startup items" is a good idea too in case a software installation has put something there without telling you.
Sometimes these sorts of issues can also involve a computer which is not actually going fully to sleep for some reason. In such cases the screen sleeps but the power light on the computer doesn't start "pulsing" as it should if the computer is snoozing properly .
Cheers
Rod

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Please do not indiscriminately dump thousands of lines from the log into a message.
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