The Switch Power Off message is usually shown when there is a media jam.
The printer must be cleared before the printer can operate again. There are two types of media jam:
A jam that prevents the carriage from moving from one side of the printer to the other.
This is called a printhead path jam. See check printhead path.
A jam that prevents the printing material from advancing into the printer correctly.
This is called a media path jam. See check media path.
check printhead path
Switch the printer off at the rear of the printer and open the window.
Look in the area where the printer was printing at the time of the jam,
this is where the printing material is most likely to be jammed.
Lift the media load lever.
Carefully remove any of the jammed printing material that you can lift up and out
from the top of the printer.
Carefully pull the rest of the roll or sheet down and out of the printer.
If there is some printing material left behind in the media path,
loading can become difficult. This can be cleared by loading a rigid printing material
through the media path.
If you have image quality problems after a media jam, this could indicate that the printheads
have been moved from their correct position in the carriage. To correct this,
align the printheads.
check media path
Switch the printer off at the rear of the printer.
Check in case the roll has almost finished and is stuck to the empty cardboard core.
Load a new roll.
contact hp
If the front panel displays the Switch Power Off message again
after you have gone through the above procedures,
make a note of the message with the error code
and contact HP.