How can I manually reset an HP printer that's stuck in a diagnostic mode?

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Grade: Education Subject: Support
How can I manually reset an HP printer that's stuck in a diagnostic mode?
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To manually reset a stuck diagnostic mode, turn off the printer. Press and hold the power button for 30 seconds. Release the power button and turn the printer back on. This often clears the diagnostic mode and returns the printer to normal operation. Consult your printer's manual for specific instructions.