HP ENVY 7645 will not print in Black

[golfmaniac]

HP ENVY 7645 will not print in Black at all. Both Color and Black cartridge were getting low. So replaced both with Brand New sealed HP cartridges. Letters would not print. So I followed the cleaning process from level 1 thru level 3. Still would not print. Uninstalled new cartridges several times and went thru the same cleaning process 2 to 3 more times. Still would not print. Unpluged the printer and let it sit overnight. No luck.  Removed the Black Cartridge and shook and tapped it very gently. Still no luck. All during the above process, did not touch the Cartridge heads. Made sure the protective head strip was removed.  Letter has 6 paragraphs. Colored each paragraph into different colors. Black, Purple, Blue, Yellow, Brown, Red, Black again.

All colors printed fine except the first and last paragraph which are Black. Printer worked just fine prior to changing both cartridges. 

[Anand_Andy]

Hi @golfmaniac,

Welcome to the HP Support Community

I understand you are facing a print quality issue with your HP Printer. Not to worry I will help you to get a resolution to resolve the issue.

To assist better:

• Does the copy print out the same way? 
• What's the application you are trying to print from? 
• Have you tried printing from a different application or device? 

While you respond to that, let's print a Print Quality Diagnostic page -Post the Print Quality Diagnostic page here so we can help you further. 

You may also refer to this document with steps to fix the " Print Quality Issues" issue applicable to your printer -  Print Quality Issues

Also, try updating the printer's firmware - HP Printers - Updating or Upgrading Printer Firmware 

If the issue still persists, I'm sending out a private message to assist you with the next course of action. 

Please check your Private message icon on the upper right corner of your HP Community profile Next, to your profile Name, you should see a little blue envelope, please click on it or simply click on this link.

Hope this helps! Keep me posted. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!