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USB devices causing G5 meltdown

Update:11-30Source: network consolidation
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A friend purchased a used G5 Dual 2.5GHz running a fresh install of 10.4.x. The machine runs fine when no USB devices are attached, but consistently crashes when a USB device is connected. Both the Maxtor external HDD and Pro Tools external audio Interface (Mbox2) result in the same behavior. The computer attempts to go to sleep and never wakes up, with the fans humming at full strength. Without the USB devices attached the machine can go to sleep without problems.
This occurs with both the front USB ports and the rear (Althoug I assume these are connected to the same controller?) The keyboard and mouse can remain connected without issues. It would appear that the USB hardware is the original.
Thoughts, next troubleshooting steps?
Much appreciated,
Jon

The Best Answer

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Ah, the good ol' cinema display. We may have Yahtzee.
That would most likely be your problem. The hubs built into those monitors are prone to failure. It is especially bad if you chain a mouse of the keyboard ports.
Try leaving the hub connections from the monitor disconnected and plug the mouse and keyboard each into its own USB port on the Mac and try that. If it works and you still need a hub try a standalone powered USB hub.
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