Imac G5 Randomly Going to Sleep

[pgclark2]

Hello,
Last night, I was loading music from CDs into iTunes, then onto my iPod using a flat-panel iMac G5. During this procedure, at various times the screen would simply go dark, the fans would briefly race, and then the Mac went to sleep. I would awaken it, and keep going, but it did this several times. I tried rebooting, and also making sure that there were no other programs running, but nothing I did seemed to help. It has 1GB of memory, so that should not be an issue. I am running Tiger, and have done the most recent updates (including the one that dims the sleep light). Any ideas? Do I need to take it in for service?
Thank you in advance.
.....

[Jim W]

have you checked the obvious, like the settings for the monitor going dim and the machine going to sleep?

Even though you are doing something with the machine, I believe mouse movement is what determines when the machine will sleep.