12-22-2019 07:23 PM
My HP Office Jet Pro 6978 printer display turned bright blue with a white outline depicting the power button and the code 83C0000B. The printer won't even turn off. Cutting the power supply is the only way to turn it off, if left plugged in and using the power button, it turns itself back on. The cartridge cradle is stuck on the right and will not budge. Help!
12-25-2019 02:44 AM
Welcome to the HP Support Community.
Let's try these steps -
1) Take out the cartridges.
2) Unplug the power cord from the printer & wall.
3) Wait for 30 seconds.
4) Plug the power cord back into the printer and wall, ensure the printer is plugged into the wall & not to a surge protector.
5) Insert the cartridges back into the printer.
Also, try updating the printer's firmware - HP Printers - Updating or Upgrading Printer Firmware
If the issue still persists, I'd suggest you Contact HP in your region regarding the service options for your printer.
Have a great day!
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