What's the catch? It needs the mirrors cleaned inside. Google hp 2600n mirror cleaning instructions for videos and websites on how to do it. I don't have the space or time. I can get another new black cartridge from the person who gave the printer to me. I dunno if he kept the old ones he took out when he bought the new ones hoping they were the problem.

Toner dust slowly builds up on the mirrors in this model and the first symptom is magenta quits printing. Cleaning the mirrors is easy - getting access to the mirrors, not so much.

Printer is gone so this can be closed or deleted.