– Cartridges with a print head (All HP, Lexmark, some Canon)
This is caused by weak contact with the printer, or dirty contact points on the cartridge or printer. Clean the print head and the printer with a lint-free cloth or paper towel dipped in alcohol, distilled water or a non-greasy cleanser. Clean in a circular motion.
Try reinstalling the cartridge. “Drop” the cartridge into the holder and slightly wiggle the cartridge a few times to ensure correct seating. Then lock the cartridge in place.
– Cartridges without a print head (Epson, most Canon, Brother, Xerox)
This is most common when using remanufactured Epson ink cartridges with a chip in the front of the cartridge. The reason is that the chip is not properly connecting with the printer. Try pushing it firmly down and make sure it is properly seated. If this does not solve the problem, turn the printer off, remove the cartridge and reinstall, making sure it’s correctly seated. Turn the printer back on and see if the cartridge is recognized. If not repeat this process until it is.