I was having a problem with my dell 3115 printer. Although I had recently replaced two of the four cartridges I began having a new problem. All troubleshooting diagrams pointed to replacing one of the new cartridges. Although I say new, I had actually purchased one of these cartridges a long time ago. I was in denial that a "new" cartridge could be causing the problems. I bit the bullet and purchased this new cartridge, and problem solved! My Dell 3115cn MFP now prints perfectly again.