Networked HP 5550 displaying "card slot not initialized"; cannot print

[CR_11]

My networked LaserJet 5550 printer displays a 'card slot not initialized' error and will not print.  Desparate as HPE support will not help and says it's an HP problem AND HP support page is of no help.  The printer resides in an office environment but the local IT people will not allow it on their network b/c of the printer's age.  It's a workhorse, just somewhat of a dinosaur.

[John_Getzke]

>My networked LaserJet 5550 printer displays a 'card slot not initialized' error and will not print. 

Some info on the error for another model here:

http://www.goline.ch/en/news/it-f-a-q/56-hp-4650-card-slot-not-initialized

And here is one for the 5550:

http://h30434.www3.hp.com/t5/LaserJet-Printing/card-slot-not-initialized/td-p/5562676

"Use the instructions in the manual for initializing the hard drive, but remove the actual hard drive that machine has installed first."

From teh Service Manual:

To initialize the hard disk

1. Turn the printer on.

2. When the Memory Count appears on the display, press and hold the MENU button.

3. When the LED's are all on and steady, release the MENU button.

4. Press and release the button. You should now see INITIALIZE DISKS on the control

panel.

5. Press and release the button.