Hello
Same problem for me. found a procedure to get back to Service Menu which works for HP 8600 :
https://h30434.www3.hp.com/t5/Printers-Archive-Read-Only/X476dw-doesn-t-boot-Help/td-p/5044674
1. Unplug the power cord (!)
2. Insert power plug while keeping power button pressed.
3. While the HP logo appears on the screen, keep the button pressed. The screen will go dark. KEEP THE BUTTON PRESSED for another 5-10 seconds.
4. Let go of the button. The screen remains black.
5. Push Home-Back-Home-Home button. The buttons are usually not visible, so refer to the manual, where they are on the touch screen. (Home is left of the upper left corner of the touchscreen, Back is left of the lower left corner)
6. A blue menu comes up, with four choices.
7. MENU on the lower right has a FULL RESET option.
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