MDD refuses to sleep or shut down...

Hi,
My mother is having a very frustrating problem with her MDD powermac. It refuses to shutdown or sleep. When I tell it to sleep, the screen goes black, and the fans stop. However, right as the fans stop, they start back up again and the computer is right back where it was. When I tell it to shut down, the computer goes through the shutdown process and restarts instead.
I've repaired the permissions, disk looks okay, reset the PRAM, unplugged all peripherals (except the monitor - third party with no hubs or computer control). I have also checked the engery saver options for auto power on on power failure.
Any ideas on what could be causing this or where to even start?
I did find a couple things that are interesting in the system logs. What do you guys think?
Jul 16 10:25:50 power-mac-g4 kernel[0]: System Sleep
Jul 16 10:25:50 power-mac-g4 kernel[0]: Sound assertion "0 != err" failed in "AppleLegacyAudio/AppleTexas2Audio/AppleTexas2Audio.cpp" at line 3648 goto Exit
Jul 16 10:25:49 power-mac-g4 mDNSResponder: Repeated transitions for interface en0 (FE80:0000:0000:0000:020A:95FF:FE67:3B46); delaying packets by 5 seconds
Jul 16 10:25:50 power-mac-g4 kernel[0]: ^PSystem Wake
Jul 16 10:25:50 power-mac-g4 configd[35]: posting notification com.apple.system.config.network_change
Jul 16 10:25:50 power-mac-g4 kernel[0]: Wake event 0800
Jul 16 10:25:50 power-mac-g4 lookupd[196]: lookupd (version 369.5) starting - Wed Jul 16 10:25:50 2008
Jul 16 10:25:50 power-mac-g4 kernel[0]: rtclock timebase_callback: late old 1000000000 / 41658765 new 1000000000 / 41658675
Jul 16 10:25:50 power-mac-g4 kernel[0]: rtclock timebase_callback: late old 1000000000 / 41658765 new 1000000000 / 41658496
Jul 16 10:25:50 power-mac-g4 kernel[0]: Sound assertion "0 != err" failed in "AppleLegacyAudio/AppleTexas2Audio/AppleTexas2Audio.cpp" at line 960 goto Exit
Jul 16 10:25:50 power-mac-g4 kernel[0]: ^Prtclock timebase_callback: late old 1000000000 / 41658765 new 1000000000 / 41658496
Jul 16 10:25:50 power-mac-g4 kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex
Jul 16 10:25:51 power-mac-g4 kernel[0]: AirPortFirmware: start Sta f/w download
Jul 16 10:25:54 power-mac-g4 launchd: Server 3757 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[196]: exited abnormally: Hangup
MDD PowerMac (Dual 1GHZ)
1.5GB RAM
OS X.4.11
Thanks for the help,
-Josh

Hi-
Have you tried a SAfe mode boot? Hold Shift whike starting. Safe mode takes a bit longer to boot than a regular boot, as various system checks/repairs are performed. Once in Safe mode, see if the sleep/shut down functions. If so, then it is probably a Startup item.
Another check would be trying a different user account. Setting up a new account with admin privledges is best. If sleep/shut down work in the new user account, then the problem is a Login item.
Troubleshooting Startup and Login Items.
If this fails to help ID/resolve the problem, an Archive and install would probably be enough.
Without testing for startup/login item conflict, an Archive and Install will carry over any existing problems.

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