Welcome to the HP Forums. I would be happy to help you with your HP Officejet Pro 8600 printer. I understand that you are getting grinding noise and you have already done some preliminary troubleshooting.
Don't worry though as I have a few steps to determine the issue and find a solution as well,
Perform Hard reset the on the printer.
Remove the power cable from the printer when it is turned on.
Remove all other cables you have connected any.
Press and hold the printer power button for 60secs.
Connect the power cable to the printer and directly to wall outlet.
Turn on the printer.
If that does not fix the issue, follow the below steps.
Clear any jammed paper from the paper trays.
Check the carriage path with a flashlight.
Clean the rollers.
Click here and follow the document to perform above mentioned troubleshooting steps.
Let me know how it goes.
Sandytechy20 I am an HP Employee
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