Dual 1 GHz PPC G4 won't sleep

Over the past week, my G4 has stopped going to sleep both by the timer, from the Apple menu and when I'm logged out. When the timer's selected, it just doesn't do anything. When I try to sleep it from the Apple menu, I get the spinning color wheel and have to restart with the power button. Trying it in log out mode doesn't do anything except make it so I can't log in again and have to restart with the power button.
My ability to fix computer problems goes about as far as /sbin/fsck -fy, but that hasn't helped. I tried checking out this, but couldn't find anything that seemed to work: http://support.apple.com/kb/HT1776
Any ideas?

Hey, fellas, thanks for responding. I do want to clarify that I told you wrong when I said I was getting the color wheel when trying to sleep the machine from the Apple menu. Rather, the monitor goes black, but the computer is obviously still running--when I press the volume change buttons on the keyboard, I can hear it clicking.
No recent hardware/software changes.
I tried resetting the PMU to no avail.
I ran the hardware test CD and got an error code "fire/3/20" on the logic board. I looked it up and found this thread suggesting I reset my PRAM and NVRAM, which I did. Ran the hardware test CD again and got the same error. Is my logic board effed? Should I be backing up all my files right now?
How would I check the battery voltage?
Console reads:
Mac OS X Version 10.4.11 (Build 8S165)
1969-12-31 19:01:19 -0500
1969-12-31 19:01:19.441 loginwindow[102] FSResolveAliasWithMountFlags returned err = -43
1969-12-31 19:01:19.442 loginwindow[102] FSResolveAliasWithMountFlags returned err = -43
2009-09-09 15:10:55.787 SystemUIServer[123] lang is:en
Sep 9 15:10:55 Carcass mDNSResponder: Adding browse domain local.
2009-09-09 15:11:55 : VCStatus can not run without an installed Version Cue CS2 workspace.
When I click on FireWire in the system profiler, it just says FireWire Bus: with nothing after it.
Allan, I have no USB devices plugged in at the moment save for my mouse and keyboard.
Thanks again for taking time out of your day to help me with this.

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    I should also mention that I didn't have any problems with my ACD 23" previously, so it would seem to be an issue with this particular display and how it communicates with my Mac Pro.

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