If your Brother ink cartridges are not recognizing in your machine, there might be an issue with gold contact chip on the end of the cartridge. To troubleshoot, remove the cartridge from the machine. Gently clean the gold contact chip with a Q-tip or lint free cloth. Be careful not to touch this chip with your fingers, as it is very sensitive. Disconnect the power cord for 10-15 seconds, plug it back in and then reinsert the cartridge.