Color LaserJet Pro MFP M477fdn stuck at 'initializing' screen

[breuniga]

Product: HP Color Laser Jet Pro MFP M477fdn
Operating System: independent

What led to the problem:  I wanted to print an envelop. It did not start printing but gave me an error message that I should power cycle the printer, what I did. Unfortunately I do not remember the exact message.

Description:

When I power on my printer, it always gets stuck at Initializing screen. I already tried all the proposals I found in this great forum and other sources in the web without success.

My son had this problem before when I was on vacation and there it went away when I got back. The printer was off for a week or so.

But this time turning it off (unplug cable) for more than 10 hours doesn't help.
Among other things, I

• removed cartridge and reset
• NVRAM reset
• Power cycle without cartridge and paper tray
• Power cycle without cartridge, paper tray and external connections (LAN, phone, USB)
• tried to connect by LAN and USB - printer is not accessible

I already exchanged the formatter board (see https://h30434.www3.hp.com/t5/Printing-Errors-or-Lights-Stuck-Print-Jobs/Color-LaserJet-Pro-MFP-M477...) but the error remains.

I followed the «Troubleshooting Manual» concerning the power on problems and from that I guess that the DC controller should be fine.

Any other ideas?

Many thanks in advance.

[Andcr]

Hello Breuniga,

If you have tried such hard reset as NVRAM and even replaced the formatter board, most likely you have a more complex problem with your printer: either firmware is corrupt or the memory section that stores such operating system image is having problems.

Our recommendation is to take the unit to a repair center for deeper inspection.