Imac G4 not recognizing Mouse

Since installing Leopard on my 800 MHz Imac G4, the mouse won't work when the CPU wakes from sleep. I've tried 3 different mice. They all work most of the time except when the computer wakes from sleep. I have to hold the power button to turn the computer off and then back on again. sometimes they work after a long wait. I have repaired permissions and run Disk Warrior 4.1. I've heard about some problems with USB devices after installing Leopard. What's the fix?

Stop sleeping your computer. Just sleep the display.

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