How do I fix a printer that is not recognizing the new toner cartridge?

1. Unplug the printer and turn it off; wait 10 minutes
2. Check to make sure the toner cartridge is properly installed
3. Make sure the protective plastic sheet is removed from the cartridge
4. Wipe away any smudges, loose toner, or debris from the cartridge
5. Plug the printer back in and turn it on
6. Test the printer to verify the issue is resolved

If the issue persists, contact the printer manufacturer for further troubleshooting.