I can help you perform a hard reset and troubleshooting the scanner light issue.
Hard Reset
Turn the printer on.
With the printer turned on, disconnect the power cord from the rear of the unit.
Unplug the power cord from the wall outlet.
Wait at least 15 seconds.
Plug the power cord back into the wall outlet.
Reconnect the power cord to the rear of the unit.
If the printer does not turn on by itself, press the Power button to turn it on.
In this document you will see, ISSUE: Problems or issues may arise when an HP LaserJet series printer is connected to an uninterruptible power supply (UPS), a power strip, or a surge protector.
^ This is not limited to Laserjet printers.
If the issue persists, call us again. If you are in Canada or US call 800 474 6836, or you can
Contact HP Worldwide.
If this helps show appreciation for my reply by hitting the “thumbs up” below, or click the "Accept as Solution" button if I have helped you reach a solution.
I hope this helps, and have a great day.
MarcelusWallace
I work on behalf of HP
★Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
★Click the "Kudos, Thumbs Up" on the right to say "Thanks" for helping!