When should I connect the USB cable during software installation on Windows?
On Windows, do not connect the USB cable until prompted during the software installation step. This is important to ensure the driver installs correctly before the hardware is recognized. For OS X users with the 2000 s1, connect the USB cable immediately before beginning software installation. (Page 3)
From the official HP Scanjet Pro 2000 S1 Sheet Feed Scanner manual, page 3
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