In the unlikely event that your printer sends you a message saying "Installed Inkjet Cartridge cannot be recognised", simply take the cartridge out of the printer and reinstall again to ensure the contact points on the cartridge and on the print head are aligned. Whilst doing so, it is imperative that you do not touch the computer chip with your fingers as the static electricity naturally created by the human body may have a detrimental effect on the chip. If the message still reappears, turn the printer off and then back on again. You may then get the usual Original Equipment Manufacturer (OEM) warning asking if you want to continue using a non-original cartridge. Simply click Yes and carry on with the normal printing procedure.
This can also be due to the chip on the inkjet cartridge having been touched with bare hands or dust on the chip surface. Clean the chip with a dry tissue and reinstall the cartridge.
The spring touching needle in the print head may also be worn or damaged.