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Did you purchase a new OEM HP toner or a refilled or remanufactured toner. It is possible that the chip is bad on the cartridge in which case if it is a true HP cartridge have them replace it. If you purchased 3rd party go after the vendor to replace it.
There is a toner sensor in this printer that shoots a beam of light through the toner cartridge. As long as the toner is full and blocks the light, it sees it as being full. If it were the sensor, it would tell you this for all the toners, though. The printer also calculates how much toner may have been used and gives warnings based on that. It could be that this isn't getting reset after you change toner. You can reset the toner gage by going into the reset menu and selecting "New xxxx cartridge" and changing it to YES.
Driver could be corrupt. Disconnect the printer or at least be sure it is turned off.
I'd do both and reinstall the CD software program that came with
the printer. When the software program asks you to connect the
printer to the USB port, do so and it should again work properly.
Hope this helps. Bud
The front panel tells you witch toner cartridge should you replace. If a supply memory error ocures then the cartridge should be replaced or exchanged with a new one. The imaging drum unit is also consumable. for "Joe 50" - there are 4 toner cartridges in the printer.