06-23-2014 08:46 AM
Welcome to the HP forums!
I'm sorry to hear you've been having issues with your Photosmart 5520 and printing in black ink only. I will certainly do my best to help
I will suggest that you begin with following the steps within this Printer Does Not Print Black Ink or Color Ink, or Prints Blank Pages document. Those steps should be able to get the black ink flowing properly again.
If that doesn't resolve the issue, please let me know whether the printer is still under warranty or not and what country you're located in. Please feel free to private message me the country information if you'd like to keep it off the forums!
07-29-2014 12:49 PM
Just wanted to check in and see if you were able to give the steps I suggested a try?
Please let me know if I can be of any further help