Hello,
If the paper jam and the toner lights are on, then the printer has an issue with the firmware on the formatter board.
Perform cold reset, if that does not resolve the issue, printer needs a formatter swap out or a repair.
Cold reset
A cold reset also resets all the HP Jetdirect settings as well as the printer settings.
Use the following procedure to perform a cold reset.
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Turn off the printer.
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Press and hold the Go button.
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Turn the printer on, and continue to hold the Go button for at least 5 seconds, but not longer than 15 seconds. During this process, the Attention LED turns on.
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Release the Go button.
If both the Attention and the Ready LEDs turn on before you release the Go button, you must start the procedure again with step 1.
The printer's LEDs begin cycling. The cold-reset process runs until completion, and the printer returns to the ready state.
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