What operating system are you using? What make and model of scanner? Does your operating system come with driver's for the scanner? Do you have driver's that came with the scanner? Can you use either? Can you download drivers from the scanner co's web site? You can get a "can't find scanner" message if scanner software is not installed and you aren't using an up to date op sys that includes drivers for it.
When you plug the scanner into the power source, and then plug it into the usb outlet, does the scanner lamp go on and the carriage move? is the carriage transport-stability-lock unlocked?
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