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I see from the post that you are having an issue with printing in black on your HP OfficeJet 6978 printer. Don't worry as I have a few suggestions which should help to resolve your concern,
To provide you with an accurate solution, I'll need a few more details:
Have you checked the print settings on the printer?
Does it happen particularly on one application or is it happening on all?
Are you able to make a copy from the printer?
In the meantime, let's try to perform a Hard reset on the printer and make sure that the printer is connected directly to the wall outlet and not to the surge protector.
Remove all the ink cartridges and then try to perform a hard reset on the printer.
With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet.
Remove USB cable, if present.
Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
Now plug back the power cable straight to a wall outlet without any surge protector or an extension cord and then plug back the power cord to the printer.
Turn on the printer and wait till warm-up period finishes and the printer is idle.
Now insert the ink cartridges and then try to print a test page and check if it works.
Let’s first try and make a “photocopy” to determine whether the issue is with the printer or not. Place a document on the scanner glass and choose “Copy” option. If the printer is making a good copy, then the printer hardware is fine.
Next thing, I would suggest here is to print a self-test page from the printer and check for test results, using this link.
Please respond to this post with the result of your troubleshooting. I look forward to hearing from you.
If you wish to help others looking for the same solution as you've found, mark the post as Accepted Solution.
If you wish to show appreciation for my effort, please click the Thumbs up icon at the bottom of my comment.
And I Hope you have a good day, Ahead.
Jeet_Singh I am an HP Employee
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