Thanks for the additional information Berel~
Have you changed anything, such as upgrading your printer's firmware, print driver, etc...?
I see you bought the 1400 keys and capsules over a year ago. If they have been working well for the past year, then suddenly stopped being accepted by your printer, and you have tried everything to get your printer to recognize them, then it may be related to the key/chip age, and I recommend getting a new set of keys to use with your current capsules.
Please let me know your results, and if you have questions or there's anything else I can help you with.
Best regards~ Dana