The Attention, Ready, and GO LEDs are on solid

contact your service provide for assistance on how to set it up

Cold reset
A cold reset changes most system parameters in NVRAM to the factory defaults. However, unlike NVRAM inititialization, a cold reset does not reset the page count, the paper tray sizes, language, or formatter number.
Note If an HP Jetdirect card is installed, remove it before performing a cold reset. Otherwise, the procedure will also reset all the HP Jetdirect settings as well as the printer settings.
To perform a cold reset
1 Turn the printer off.
2 Press and hold down the GO button.
3 Turn the printer on, and continue to hold the GO button for at least 5 seconds, but not longer than 15 seconds. During this process, the Attention LED will turn on.
4 Release the GO button.
Note If both the Attention and the Ready LEDs turn on before you release the GO button, you must start the procedure again with step 1.
5 The printer's LEDs will begin cycling. The cold-reset process will
run until completion, and the printer will return to the ready state.

If not work, tris this

NVRAM initialization

CAUTION Only perform the following procedure if absolutely necessary.
Performing an NVRAM initialization resets some parameters that cannot be restored later.
NVRAM initialization sets all default variables stored in NVRAM back to factory default values or to a default ROM value, depending on the variable. It also performs a system reset.

NVRAM initialization resets the following:

• all menu settings to factory default values

• factory settings such as formatter number, page counts, and factory paper settings
  

To perform NVRAM initialization
1 Turn the printer off.
2 Press and hold down the GO button.
3 Turn the printer on, and continue to hold the GO button for at least 20 seconds. During this process, the GO button, Attention, and Ready LEDs will each turn on.
4 Release the GO button.
5 The printer LEDs will begin cycling. The NVRAM-unit process will run until the printer is in the ready state.

you may have a fetal error, press the button to see the secondary error code

Try removing the jetdirect and power cycle the printer.

Try resetting the printer:
Note: it will erase all network settings.

Turn the printer off, press and hold the GO button, turn the printer back on, continue holding the GO button for at least 10 seconds, but for fewer than 20 seconds. After the Go, Attention, and Ready LEDs turn on, release the GO button. During this process, the Attention LED will turn on, the LEDs will begin to cycle, and the unit will perform a cold reset until the printer returns to the Ready state.

NOTE: If either the Go or Ready light turn off or no LEDs turn off before the GO button is released, repeat the process.

For PCL XL error: try to reinstall the printer drivers.

from service manual:
To perform a NVRAM init
1 Turn the printer off.
2 Press and hold the GO button.
3 Turn the printer on and continue to hold the GO button.
4 After the Go, Ready, and Attention LEDs turn on, continue holding for at least 20 seconds.
During this process, the Attention, Ready, and Go LEDs will each turn off.
5 Release the GO button.
6 The device LEDs will begin cycling from front to back. The NVRAM-init process runs until the
printer is in the Ready state.

Hi naseeh83: Here your problem. Fuser error. The fuser has a malfunction. Try these steps. 1. Unplug the printer for at least ten minutes. 2. Verify that the fuser connector and thermistor connector are both firmly seated in the ECU 3. Perform a heating element resistance check. 4. If the resistance readings are correct, but the error persists, replace the fuser. You may have to call a certified HP technician to repair this printer. Hope this helps.

Hello,
If the paper jam and the toner lights are on, then the printer has an issue with the firmware on the formatter board.

Perform cold reset, if that does not resolve the issue, printer needs a formatter swap out or a repair.

Cold reset A cold reset also resets all the HP Jetdirect settings as well as the printer settings.
Use the following procedure to perform a cold reset.

1. Turn off the printer.
   
2. Press and hold the Go button.
   
3. Turn the printer on, and continue to hold the Go button for at least 5 seconds, but not longer than 15 seconds. During this process, the Attention LED turns on.
   
4. Release the Go button.
   If both the Attention and the Ready LEDs turn on before you release the Go button, you must start the procedure again with step 1.

The printer's LEDs begin cycling. The cold-reset process runs until completion, and the printer returns to the ready state.

Hello,

Please perform the following:

Unplug the network Cable:

Cold reset A cold reset changes most system parameters in NVRAM to the factory defaults. However, unlike NVRAM initialization, a cold reset does not reset the page count, the paper tray sizes, language, or formatter number.
A cold reset also resets all the HP Jetdirect settings as well as the printer settings. Use the following procedure to perform a cold reset.

1. Turn off the printer.
   
2. Press and hold the Go button.
   
3. Turn the printer on, and continue to hold the Go button for at least 5 seconds, but not longer than 15 seconds. During this process, the Attention LED turns on.
   
4. Release the Go button.
   If both the Attention and the Ready LEDs turn on before you release the Go button, you must start the procedure again with step 1.

The printer's LEDs begin cycling. The cold-reset process runs until completion, and the printer returns to the ready state.


Network reset A network reset changes all network system parameters in NVRAM to the factory defaults. During the network-reset process, all button presses are ignored.
Use the following procedure to perform a network reset.

1. Turn off the printer.
   
2. Simultaneously Press and hold the Go and Job Cancel buttons.
   
3. Turn on the printer and continue to hold the Go and Job Cancel buttons for approximately 10 seconds, but no longer than 20 seconds. During this process, the Attention light turns on.
   
4. Release the Go and Job Cancel buttons. The Attention , Ready , and Go lights begin cycling from front to back. After the network-reset process is complete, the device returns to the ready state.
   If the Attention and Ready lights illuminate before you release the Job Cancel button, start again at step 1.

Now plug in the network cable and then wait for 5 mins.
Then print a configuration page and check the IP Address.

hi friends......
shivachadra is here.....just i faced this problem "Attention, Ready, and GO LEDs are on solid"
and i got solution in troubleshooting....just vi refixe the connetion of laser scanner........its the error of comunication between laser scanner and formatter....