The product name is HP Photosmart 6525 e-All-in-One Printer. The printer has quit printing in black. (tried after 2 new black cartridges have been installed). It does print in color. Why?
I have gone through your Post and would like to help
I suggest you follow the instructions in this Link: https://support.hp.com/in-en/document/c03954004
If the issue persists please contact HP Support for Service Options
Click on this link - www.hp.com/contacthp/ and select your Country to get the Contact details for HP Support
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KrazyToadI Am An HP Employee
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