Hello Garp,
Thanks for your help.
I am no able to turn off the printer, once I reconnect the plug, the screen flashes with the error code and when I press the power button, the screen is blue.
https://support.hp.com/in-en/help/printscandoctor : does not work because it failed to communicate with the printer.
I could I use the Hp Printer & Scan Doctor to fix this issue ?
Many thanks,