I have a HP 7500a printer that quit printing black. I have replaced the cartridge and put in a new printhead 2 weeks ago. I have cleaned the printhead several times today and also aligned it, now I am getting a message that it won't align. I have turned the machine off and on and still doesn't work. What is next? a new machine???????
The alignment will fail if black and the alignment color is not printing properly. The troubleshooting steps in the document here may help resolve black not printing. Be sure to go through all the steps in order and be sure to check the vent as shown in step 4.