Hello. Thank you for your question. My goal is to provide excellent customer service.
I understand that you are having problems with your OfficeJet 6500. I can help you with that.
Your printhead may have the black nozzle clogged. First, you need to clean the printhead by using the Settings - Tools- Clean Printhead menu. If that does not help, you need to clean it manually. I can give you instructions for that.