HP S20 - Manual (Page 11)

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Quick Setup
4. Connect the rectangular end of the USB interface cable to the USB
connector on the front or back exterior of your PC.
5. Connect the square end of the USB interface cable to the USB connector
on the back of your photo scanner. (The USB connector is to the right of
the power connector on the back of the photo scanner.)
Note: The S20 photo scanner does not have a power switch. Thus, the
photo scanner is always on while it is plugged into a power source.
The photo scanner does, however, have a “sleep” mode for low
power consumption when it is not in use.
6. Click the Connected button in the HP PhotoSmart Setup Wizard dialog
box, and then go on to the next page.