Is the USB cable connected to the computer and the ScanSnap?
Perform one of the following:
Connect the USB cable to the computer and the ScanSnap.
If you are using a USB hub, connect the ScanSnap directly to the computer via a USB cable.
Unplug the USB cable from the computer and the ScanSnap, then plug it back in.
Make sure to leave at least 5 seconds between plugging and unplugging the cable.
Is the feed guide open?
If the feed guide is closed, open the feed guide to turn on the ScanSnap.
Has the computer just been started up, or resumed from sleep mode?
When the feed guide is open while the ScanSnap and the computer are connected via a USB cable, the ScanSnap is turned on/off in conjunction with the computer's power.
When the startup of the computer is not completed or the computer is in sleep mode, the ScanSnap may be turned off.
Wait until the [Scan/Stop] button on the ScanSnap lights on.