Re: bought 4255e printer yesterday all works except won't print black. Bad unit or bad cartridge?

If your HP 4255e printer isn't printing black, try these main steps:

1. Check ink levels to ensure the black cartridge isn't empty or dry.
2. Run a printer diagnostic or print a test page to check for printhead issues.
3. Remove and reinsert the black cartridge to ensure it's seated correctly.
4. Clean the printhead using the printer’s maintenance tools.
5. If the issue persists, replace the black cartridge as it could be defective.

Let me know if that helps!