I've found an odd problem here at work. We've got some new Dell Optiplex GX260. After loading Knoppix (which seems to work fine) and then after shutting down, the computer won't reboot. It doesn't even post the bios. Just powers on and stays black.

Thankfully, it is recoverable -- the trick is to unplug the power from the back of the box and then restart. Any ideas on why the Knoppix CD or shutdown process would put a box in this state?