Deskjet 800ps 79:04 error at End of initialization sequence

[iamdrewb]

I am getting a 79:04 error right at the "End of initialization sequence". I have been unable to solve this issue with about 3 months of trial and error.

Trouble shooting steps I have taken:

• Power Cycle
• Remove all ink cartridges, print heads and media
• Reset EEROM. I hear the beep during the initialization sequence but upon reaching the End of initialization sequence I get a 79:04 error
• Update the firmware. I was able to successfully update to firmware version A.04.02, however upon reaching End of Initialization sequence I get a 79:04 error
• LEDs on the formatter produce a solid green and blinking yellow, indicating it is working fine. As well, I did attempt to boot the printer without the formatter card installed
• Attempted to boot without NIC installed
• Swapped the Formatter and NIC

The 800ps is not connected to the network. I can't figure out how to get a hold of HP support as the prompts leading up to where it actually lets you contact support don't seem to recognize my serial number.

I am unable to enter the Service Menu/Service Mode

I am starting to question that maybe the failure is happening one step before at Initializing the communication between Main PCA and Formatter as it sits on this step for a few seconds and then flashes to the 79:04. I can't confidently tell that the last box is being filled.

[Repairatrooper]

You will likely get no support from HP as this unit was end  of life at least 10 years ago. Most tech staff have probably never laid eyes on one.