Pixma iP4200

You either have bought a bad cartridge, or are using a generic or refilled cartridge, or have damaged the contacts in the carriage assembly.

Replace the same cartridge again only make sure you use a new Canon cartridge. If this does not help, either the contacts in the carriage assembly are bad or the main board has bit the dust.

Repairing the contacts would require you to remove the upper case so you can access the contacts, remove the ink cartridge and streighten out the contacts before reinstallig the cartridge.

The contacts are located at the front of the carriage assembly under the ink cartridge.