C 1.04 - "Refer to printer documentation"
If you get this message, you should follow the following instructions:
Step 1. Hit it a couple times with either your fist or your shoe.
If that doesn't help, proceed to step 2.
Step 2. Press the power button to switch it off.
Step 3. After a couple of seconds, switch the printer back on.
If you see this message again, proceed to step 4.
Step 4. Press all the buttons.
If it still displays the same message, proceed to step 1: start bashing.