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Cartridge 21 & 21B are similar cartridges, instead of 21 can be replace with21B.. Only difference between them are economy in pricing & yield.. 21B is lesser cost than 21..But both genuine packs are manufactured by HP,
I had this problem. My HP F380 also stopped accepting professionally filled cartridges too. The only solution was to start buying HP cartridges. Thankfully these are much cheaper on eBay than buying at the RRP in shops or elsewhere online.
the most important is to remove all the air from the cartridge that has left inside durring refilling that is why professionals are using special machines that refill in 0 air πρεσυρε using vaccum pump
you can check here a video on how to refill with out any special equipment
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
I have this printer with the same problem , worked fine for 1 year, printed over 1600 pages total ( according to the built in HP program that records how many pages I printed and how many times I used the printer) then it stopped printing. The ink cartridges are new, the software is fine, and it says ink levels are good. It physically goes through the motions of printing, loads the paper, makes all the normal sounds it used to and pushes out the paper when it's done - but the page is blank. I did some surfing and read some info that some HP printers are pre-programmed to stop certain functions so you buy a new printer. I know that might sound crazy. How long have you had the printer and how many pages do you think you printed?