I tried everything, and finally found something that worked for mine--I went into:
Setup. --then "Device Settings". --then "Reset Settings". --then "Reset All".
Of course, then I had to re-connect to wifi. But finally this ridiculous little printer will recognize the new ink cartridge. Mine was a problem with the black. It was because I changed it, before it was completely empty. It was printing terribly and wasting paper. Then of course, it wouldn't recognize that it had a new cartridge in it. I tried ever suggestion out there, and I even took the darn printer apart so I could put in another new cartridge, because it wouldn't slide to where I could access the black ink again. But that didn't work either. You know I swore that I would never buy another POS HP printer because they act like this, that is why I switched to Canon. I first bought an MF4800 and I love that one-but it has a toner cartridge and is just black.
