08-26-2019 09:35 AM
My Office Pro 6978 has been printing only with blue ink. I thought that it was because the cartridges were low, but I replaced all of them today(except black, which is half full) and it still prints in blue only.
08-26-2019 09:43 AM
The possible cause for the issue you are facing could be clogged nozzles, improper cartridge installation etc.
Below is the link to troubleshooting document that should fix the issue.
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Click "Accept as Solution" if it solved your problem, so others can find it.
Although I am an HP employee, I am speaking for myself and not for HP.