The printer says it can't recognize some print cartridges and asks you to replace them. You replace them, but nothing happends. After fiddling around with it for a while, eventually it works, but another cartridge shows the error. Possible Solutions:
1. Pull the plug. Take the energy away from the printer to reset the memory. Leave it without power for a few minutes. Try not turning it off first.
2. Reset the chips. This often happens with replacement ink or canon chips on replacement ink tanks. Go to the ink store, they usually have chip resetters.
3. Clean the contacts on the printer and the ink chips with ISOPROPYL Alcohol.
AT YOUR OWN RISK! If nothing works, try Canon original ink. If that doesn't work, contact Canon. Good luck!