Hi there,
I know this discussion is old, but I didn't want to launch a new topic.
I'm having the same problem with an HP LJ 4100N at the moment.
The printer occasionally displays the message "49.FF04", other than that it displays only stars "*********************". It's unable to print. When I remove the Jetdirect 610N card the message disappears. I'm able to print menue structure, configuration page and event log.
What do I do next? Do I have to replace the Jetdirect card?