Does anyone know HP all-in-one tricks?

[Bob]

I have one that the scan stepper keeps beating its little head against the wall like its not lined up then when it stops there is an hourglass on the display that won't go away.

I've tried all the online "tricks" I could find
reset (3 ways) moved the scan head to the other side hoping it would line up, etc.

does anyone have a clue?

[daworm]

Probably has a bad sensor, or one covered in dust or something. There should be a limit sensor that lets it know when it gets to the end, and if that is bad, it won't know and keep trying to move the head, eventually causing an error. Might be hard to find and harder to fix.

[Bob]

Thanks! I thought of that but didn't think about it covered in dust. I couldn't find it but if I blew it all out it might just "get" whatever is on the sensor.