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Black cartridge will not print

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Photosmart 7520
macOS 11.0 Big Sur

On my HP Photosmart, a new  black cartridge, properly opened, unwrapped, and clicked in, will not print -- nor will another new one I tried.  All three color cartridges and the photo black  are functional, and all area also HP cartridges.  I've run all the diagnostics on the printer, and nothing changes -- the Print Quality Diagnostic always shows an empty panel for the Black cartridge.  My computer, however, show Black as being full under Supply Levels.  I went through the Virtual Assistant routine and performed all the steps, except for taking out the print head and washing it in warm water, which I decided was overkill and unhelpful.  Any suggestions?

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Hi @OrganistJohn, 


If you have already performed the steps from the document Black or Color Ink Not Printing, Other Print Quality Issues and the issue persists, it could be a hardware failure.

Please reach out to the HP Support in your region regarding the service options for your printer.


If you are having trouble navigating through the above options, it's most likely because the device is out of warranty. If yes? please send me a private message with the region you are contacting us from. Check next to your profile name, you should see a little blue envelope, please click on it. 


Hope this helps!


And, Welcome to the HP Support Community. 


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