Printer cannot print. screen show 49.4C02 . Service error

SOURCE: hp laserjet 4650n

Hi 123sha:
49.XXXX
PRINTER ERROR
To continue
turn off then on
A critical firmware error has
occurred that caused the
processor on the formatter
to abort operation. This type
of error can be caused by
invalid print commands,
corrupt data, or invalid
operations. In some cases,
electrical noise in the cable
can corrupt data during
transmission to the printer.
Other causes include poorquality
parallel cables, poorconnections,
or home-grown
programs. On rare
occasions, the formatter is at
fault, which is usually
indicated by a 79 Service
Error.
1 Press CANCEL JOB to
clear the print job from
the printer memory.
2 Turn the printer off and
then on.
3 Try printing a job from a
different software
program. If the job
prints, go back to the
first program and try
printing a different file. If
the message appears
only with a certain
software program or
print job, contact the
software vendor for
assistance.
4 If the message persists
with different software
programs and print jobs,
disconnect all of the
cables to the printer that
connect it to the network
or computer.
5 Turn the printer off.
6 Remove all memory
DIMMs or third-party
DIMMs from the printer.
7 Remove all EIO devices
from the printer.
8 Turn the printer on.
9 If the error no longer
exists, install each
DIMM and EIO device
one at a time, making
sure to turn the printer
off and on again as you
install each device.
10 Replace a DIMM or EIO
device if you determine
that it causes the error.
Try new network card
pdouglasss