G5 shutting down rather than sleeping

Hi,
In the past few days my iMac G5 (approx. three years old) has been shutting itself down rather than going into sleep mode. I know it is not an issue of sleeping and not reviving because the power pulse light is not on. No problems in normal operation (i.e. does not shut down suddenly or unexpectedly during use).
I haven't done anything out of the ordinary or added any software recently. I did have to unplug the computer rather than shutting down properly over the weekend when it froze and wouldn't respond to command/option/escape while I was finishing a backup of iTunes (manual backup, last disc out of 13).
We normally let the computer sleep rather than shut it down--I downloaded & ran iJanitor last night on the rec of some other past discussions on similar topics but to no avail.
Thanks for any help.

I am having the exact same issue that BSeque described initially. For me, the shutdown only happens after I send the iMac to sleep - for example, it will shut itself off overnight. It never occurs if I am actively using any applications.
It also seems to be taking a long time when "finding local drives" on startup which it never did previously (about two minutes of just that message on the screen during startup). My wife has reported a loud noise upon startup on several recent occasions, and I have also had to pull and replace the power cord several times recently when the normal power up procedure wouldnt work.
I am also in the number range for the repair extension, but am interested in knowing if there are any steps to take before I bring it to the Apple Store.
After reading a suggestion on another post, I pulled some of the system logs. Here is a sample sequence for one of the time periods when shutdown occurred involuntarily:
Sep 14 20:44:17 localhost pppd[261]: Connection terminated.
Sep 14 20:44:17 localhost pppd[261]: Connect time 184.3 minutes.
Sep 14 20:44:17 localhost pppd[261]: Sent 821251 bytes, received 5081427 bytes.
Sep 14 20:44:17 localhost pppd[261]: PPPoE disconnecting...
Sep 14 20:44:17 localhost pppd[261]: PPPoE disconnected
Sep 14 20:47:55 localhost pppd[261]: Terminating on signal 15.
Sep 14 20:47:55 localhost pppd[261]: Exit.
Sep 14 20:47:56 localhost mDNSResponder[146]: mDNSResponder Sleeping at 11439805
Sep 14 20:47:56 localhost configd[86]: executing /System/Library/SystemConfiguration/Kicker.bundle/Contents/Resources/set-hostna me
Sep 14 21:47:32 localhost syslogd: restart
Sep 14 21:47:32 localhost syslogd: kernel boot file is /mach_kernel
Thanks.

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