HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 174)

EN Printer Response Problems 173
Printer Response Problems
Problem Cause and Solution
No display message The printer might be in Power Save mode. Press G O to
bring the printer online.
The printer control panel display appears blank or is not
lit, even when the fan is running. The printer is in
standby mode (off). Turn the printer on (button in).
The power cord is not firmly plugged into both the
printer and the power receptacle. Remove and
reconnect the power cord.
The line voltage is incorrect for the printer power
configuration. Connect the printer to the correct line
voltage as specified on the Power Rating label on the
back of the printer.
The power cord is damaged or excessively worn.
Replace the power cord.
The power source receptacle is not working correctly.
Connect the printer to a different power receptacle.
If you recently installed DIMMs or a printer hard disk,
verify the communications board was reinstalled
correctly. For more information on installing DIMMs, see
appendix
A , “ DIMM Installation ;” for more information
on installing a printer hard disk, see the installation
guide included with the printer hard disk.
Tray 4 will not power on The power cord is not firmly plugged into both the
printer and the power receptacle. Remove and
reconnect the power cord.
Verify that the cables are firmly attached between tray 4
and the printer. Also, verify that the cables are
connected to the correct connector. For more
information on connecting the cables between tray 4
and the printer, see the getting started guide.