LEXMARK 8350 - Right Printer Cartridge error

take cartridge out again and inspect carefully the circuit inside the printer where the cartride goes. Look for dust, dirt, ink etc. Try using a can of air to clean the area too. Not sure if it will be visible but look for a ribbon cable near the circuit area too that may be loose. You might want to take it to a local computer shop ( not a chain store like best buy etc ) often they can do a simple repair pretty cheap and fast. Good luck