WARNING: The Format Disk option performs a disk initialization on the entire disk. The operating system, firmware files, and third-party files (among other files) will be completely lost. If you are uncomfortable performing this step, please contact HP Customer Support .
Touch the HP logo that displays in the center of the touchscreen until the Preboot menu opens.
Use the arrow buttons on the touchscreen to navigate the Preboot menu.
Touch the OK button to select a menu item.
Turn the printer off, and then on.
Wait for both the Ready and Attention LEDs to illuminate and then dim out. The HP logo will appear on the control panel display.
When the LEDs illuminate again, press the Stop button on the control panel.
NOTE: The period of time for opening the Preboot menu, while the Ready and Attention LEDs are illuminated, is around one second. You might need to press the Stop button repeatedly while the product is starting up to make you sure you gain access to the Preboot menu.