I had the same problem as another user of this printer only it was when changing the color cartridge. I worked with an HP technician and they could not help me. Basically the printer melted down after I attempted to change the tri-color cartridge. It would no longer recognize the cartridge even after cleaning the cartridge and the printer contacts. It will not print correctly with the black cartridge either now. I've had it for maybe 1 1/2 years. HP printers used to run a lot longer. I'm moving on to another brand.