This may work with your Designjet 500 or 800 if the install of the latest firmware now makes your plotter aware of expired inks --- I haven't tested it. Let me know if it works. Thanks!
If you cannot print is not because the ink is expired.
Try this.
1- delete all the pending jobs at the printer panel
2- reset the ink cartridges and acknowledge the warnings
3- print the Image Quality Print to check the status of the nozzles ant the printheads.
4- replace any bad printheads
5- do the printhead alignment and paper advance calibration
6- print an internal demo to test the hardware
If you cannot print is not because the ink is expired.
Try this.
1- delete all the pending jobs at the printer panel
2- reset the ink cartridges and acknowledge the warnings
3- print the Image Quality Print to check the status of the nozzles ant the printheads.
4- replace any bad printheads
5- do the printhead alignment and paper advance calibration
6- print an internal demo to test the hardware