I have a HP750 and changed both black and colour cartridge, I got only for the black one a message:...
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I have a HP750 and changed both black and colour cartridge, I got only for the black one a message: wrong black cartridge installed (no mistakes in type of cartridge). When I replace it with the "old" black cartridges there are no probs. I contacted HP helpdesk, where they say it is a hardware prob and I should buy a new one. Please give me your advice.