Is the power cable connected to the ScanSnap and the AC outlet?
Connect the power cable to the ScanSnap and the AC outlet.
Did you press the [Scan] button or the [Stop] button on the ScanSnap?
Turn the ScanSnap on by pressing the [Scan] button or the [Stop] button on the ScanSnap.
Are you using the AC adapter and cables that are bundled with the ScanSnap?
Use only the AC adapter and cables that are bundled with the ScanSnap.
Is the AC adapter and the AC cable connected properly?
Insert the AC cable plug all the way into the AC adapter.
Has the computer just been started up, or resumed from sleep mode?
When the ScanSnap is turned on, it is turned off in conjunction with the computer power-off.
Turn the ScanSnap on by pressing the [Scan] button or the [Stop] button on the ScanSnap.
An error may have occurred in the ScanSnap
Disconnect all the cables from the ScanSnap, reconnect them after 10 minutes, and then check if the problem is solved.