Https://support.hp.com/us-en/document/c01817193

Solution one: Turn the printer off and then on again
Follow these steps to restart the printer.
Press the Power button to turn off the printer.
Wait 60 seconds, and then press the Power button to turn on the printer.
Solution two: Plug the printer directly into a wall outlet
Make sure that the printer is properly connected to a suitable power source.
Press the Power button to turn off the printer.
Disconnect the printer's power cord from any power strips or surge suppressors and then plug it directly into a grounded wall outlet.
Press the Power button to turn on the printer, and then try to use the menu to check if the printer control panel is functional.
Solution three: Reset the printer
Follow the steps below to reset the printer.
Turn the printer on, if it is not already on.
Wait until the printer is idle and silent before you continue.
With the printer turned on, disconnect the power cord from the rear of the printer.
Unplug the power cord from the wall outlet.
Wait at least 60 seconds.
Plug the power cord back into the wall outlet.
NOTE: HP recommends connecting the printer power cord directly to the wall outlet.
Reconnect the power cord to the rear of the printer.
Turn on the printer, if it does not automatically turn on.
Wait until the printer is idle and silent before you proceed.
Solution four: Service the printer
These steps direct you to the appropriate service provider.
Service or replace your HP product if the issue persists after completing all the preceding steps.
Go to Contact HP Customer Support to schedule a product repair or replacement. If you are in Asia Pacific, you will be directed to a local service center in your area.
To confirm your warranty status, go to HP Product Warranty Check. Repair fees might apply for out-of-warranty products.