“Can I print BLACK ONLY with my HP 6978 OfficeJet using only the black hp 902 black cartridge in the machine?”

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• No, you need to have all 4 cartridges in the OfficeJet 6978 printer in order for it to print.

  Answered by HP Team 4 years ago

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• Yes.

  Answered by SusanM 3 months ago

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