Problem: On an XP workstation, I was able to install the driver for an HP Scanjet 4570c, but the system didn't recognize it. The USB cable was fine and properly connected, and the device was powered on.
Solution: Disconnect the power from the scanner and then reconnect it. You should immediately see the plug and play dialog and the scanner will show up in the device list.
NOTE: This particular scanner was using a USB extension cable, to further complicate the situation. As it turned out, the device wouldn't work even after the above problem was solved until I removed the extension cable.
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