“I have two of these. One prints in black only. The other one prints in color (lighter shade), no black printing. What can I do to remedy this? HP OfficeJet Pro 6978”

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• Check the date on your ink. That happened to me before and when I replaced the ink it worked. The ink hadn't expired yet either.

  Answered by dmosp 4 years ago

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• I had the same issue. After time on the phone with HP service, it was determined that my software may have been contaminated. They were going to reload the software; but it was going to be around $90.00. I decided to replace it instead. But maybe reloading your software will work for you.

  Answered by Regis 4 years ago

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