HP printers are widely used for both official and personal purposes around the world. Many consumers, however, have reported that their HP Photosmart 6520 not printing black ink. If you're having trouble, it's possible that a blockage in the printer head vent is to blame. Your printer head is unable to print in black or any other color as a result of this. We provide you a solution to this problem. Without previous notice to users, we reserve the right to alter, remove.