Full Cartridge Not Printing All Cartridges Were Full But Not Printing Hp Photosmart 6525

Chosen Solution

I changed the printer cartridges in my HP Photosmart 6525 printer and now when I go to print something out the paper comes out blank

I have used several YouTube videos on how to clean the inkjet heads. Worked for the color ones. Black is still not working. This is a complete breakdown. https://youtu.be/KxJuTWGMWVU Here’s a partial cleaning, w/o disassembling: https://youtu.be/K76eANwoY64