Sometimes when a compatible ink cartridge is installed in a HP printer, the printer will reject the cartridge. Initially, check that the ink cartridge is the correct cartridge for that printer. An obvious, but necessary suggestion. If you are unsure or the markings on the cartridge are unclear, contact your supplier for advice.
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There is also the tried and tested method of switching the printer off and on again, this may help clear the printer’s memory and enable the cartridges to be recognized. There are some of the newer HP printers that have software installed that will prevent the user from using compatible or remanufactured inkjet cartridges. Your ink supplier should be able to advise you if your model is one of these printers. A useful tip when purchasing a new printer is check with the seller if that printer will work with a set of compatible ink cartridge so you can make savings on your ink as soon as the factory supplied ink that comes with your printer runs out.