My black 73N cartridge ran out and so i recently bought the 91N or economy one to replace it. However, the printer won't recognise the cartridge and so i am unable to print anything. I then went back to the store to find out what's wrong and the salesman suggested that the chip might be faulty so he suggested i buy another one. I proceeded to buy the 73N cartridge just in case (as those were the ones i had in my printer originally), as well as the cyan cartridge as it too had run out. i have followed the installation guide including the computer one and still, my printer won't recognise the cartridges.I don't understand why this is so because i have replaced the cartridges numerous times and it has worked every time. If you have any solutions that will be greatly appreciated
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