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HP Recommended
Photosmart 6520
Microsoft Windows 10 (32-bit)

The printer was working fine until I changed the black ink cartridge. Now it will not print black. I have now tried with TWO new HP ink cartridges. Neither prints. I have tried the reset, print head clean, etc. There are no error messages and the ink level shows full but the diagnostic print shows no black ink in the colour block. Grateful for any advice.

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