Canon printers, like many other brands of printers, use drivers and a software package to work with a connected computer. The drivers enable the printer and computer to communicate with each other properly, while the software helps you manage the operation of the printer from the computer. Part of the software is an ink monitor, which will alert you if the cartridges are low or out of ink. If you install a refilled cartridge, the ink level monitor will display an error every time you try to print.
Open the printer's ink cartridge access door and install a refilled cartridge. Begin printing until you see an error message appear on the computer's screen.
Click the "OK" button at the bottom of the message stating that the printer's software cannot detect the amount of ink inside the refilled cartridge.
Click the "Yes" button at the bottom of the next message window. You are acknowledging that damage can result from using a refilled cartridge and that the software will no longer be able to detect the ink levels.
Click the "Yes" button on the next screen, acknowledging that Canon will not be responsible for any damage done to the printer by the refilled cartridge.
Hold down the "Resume" or "OK" button on the printer for five seconds or more until the message disappears. If your printer has neither button, hold down the button that is flashing until it stops.