What should I do if I see a 'Cartridge is very low' or 'Used or counterfeit cartridge' error?

If you receive an error indicating the cartridge is very low or that a used or counterfeit cartridge is in use, you should replace the toner cartridge with a new one. If you see an 'Incompatible,' 'Protected,' or 'Unauthorized' cartridge error, take out and reinsert the toner cartridge; if the error persists, visit www.hp.com/support/ljM255.