4. Defective Cartridge
If you are unable to clean the cartridge after several attempts the cartridge may be defective and eligible for replacement.
There are only three reasons for a defective cartridge:
1. Clogged nozzles. (Banding / poor quality)
2. Mixing Colors (Colors are different from one cartridge to the next)
3. Cartridge not recognized (Not able to print)
Clogged nozzles can usually be fixed by the cleaning procedure explained above. You may have to repeat the cleaning procedure more than once. If the cartridge still does not work, the cartridge is probably defective.
Mixed Colors can be diagnosed before you even put the cartridge in the printer by the same cleaning procedure described below. Check for red, yellow, and blue when you manually clean the cartridge. If the colors look different from one cartridge to the next, you'll know that the cartridge is defective. If the colors appear to be correct after the manual cleaning, then the colors are mixing at some other point in the printing process. See the first article below.