I have a dell dimension running XP Pro. The USB devices started failing ... mostly the computer would not recognize flash drives. I moved the computer to a different location, installed patches, did basic software maintenance, and returned the computer to its original location and suddenly the USB ports worked again. Then suddenly the USB ports stop responding again weeks later. I notice one port does not seem to be supplying power while others are because USB hard drives will spin up and XP recognizes, but aalwaaays installs it as an "unknown device".
I have gone into the registry and removed ?? devices from mounted devices with no change. Still no recognition of anything from printers that were working fine to flash drives to battery backup data ports.
Any ideas? Thanks