I have a Canon D660U USB scanner. The lamp does not come on at boot and it will not respond to any buttons. The device is detected when I plug it in and it does appear in device manager (working properly), however, when I pull up the scanner properties in control panel, the status is indicated as "unavailable". OS is W2K SP4. I have tried:
1. cycling power (both scanner and computer)
2. switching usb ports
3. removing device, uninstalling & reinstalling drivers (have most current available)
I have had this scanner for a couple of year and have never had a problem until now. I can't recall if I have used it since installing SP4.