Hp Compatible 932XL, 933XL, 950XL, 951XL, 920XL, 940XL, 934XL, 935XL, 953XL chips not recognising, or error messages etc..
HOW TO FIX......
1. Take out the non-recognising cartridge, switch off the printer for 30 seconds, turn on the printer and reinstall the cartridge.
2. Reinstalling the cartridge rotates the serial no. Users can do it up to 5 times EACH INK. This usually solves any issues, as its unlikely you have changed the inks so many times that the printer has seen all 5 serial numbers on each of those cartridges before.
It is vital that if they get a failure message or non-recognising cartridge you must take the offending ink out and reinstall it up to 5 times. To be sure that it has attempted all 5 serial numbers on each cartridge.
If there is still a failure its best to exchange the ink, as its likely that the chip is faulty or the replacement will be from a different batch and therefore have 5 more different serial numbers on it.