mobo is Dell Precision 450 workstation, on board USB2.
knoppix is 5.01
I switched ports & hubs and now I often get boot failure -
autoconfiguring devices runs forever -
the bar goes across the screen and off the edge.
With either hub, or connected directly, the thumb drive power
light is on, even when the computer is turned off.
(no prob on single CPU computer - its USB ports shut off)