Unplug the power cable, press and hold :
OK and CANCEL, while keeping them on hold put the power cable back in ... it ll do a full NVRAM reset on it ..
It ll be fixed .
Best of luck
It has something to do with the power supply.
1. Remove the printer from any UPS supplies, additional power supplies, or power strips.
2. Plug the printer into a wall outlet and see if this resolves the problem.
3. If the printer is already plugged into a wall outlet, try another power source in the building that is independent of the one currently being used.
4. The line voltage and current source at the printer location might need to be inspected to ensure that it meets the printer's electrical specifications.
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