Screen Saver and Display Sleep No Longer Work

My set up:
Mac Pro (stock) w/ 3GB RAM running 10.4.8.
Two ADC displays connected via ADC to DVI adapters
Issue:
Recently I've noticed neither my screen saver nor display sleep work. I can get the machine to sleep manually, but not automatically. My energy settings have the display sleeping after 10 min w/ the computer and HDs never sleeping. Screen Saver is set to go on after 5 min.
My MP used to go into screen saver -> display sleep mode fine. I don't know exactly when the issues started, but probably around 10.4.8. I have not installed any major software recently other than normal Apple updates.
What I've tried:
I've tried resetting the Energy Setting and Screen Saver Prefs and then doing a restart.
If anyone has an idea what is preventing my MP from going into screen saver -> display sleep mode please post. This is driving me nuts.
MacBook Pro 1.83 (7200 HD)/ MacPro 2.66/ mini 1.5Ghz / PBG4 1.25Ghz   Mac OS X (10.4.8)  

Turned out a bad USB device was preventing sleep. Once I removed it the display went to sleep like a baby.

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