I have an all in one hp 750 printer, and after refilling the balck cartridge, Which I have done in the past successfully, I got the error message that "incorrect black cartridge" even though it was an original HP cartridge. So I purchased a replacement compatabile cartridge & I get the same message. Is there a reset on the printer? I get this message without even trying to switch the pc on.
Thanks gongoozler, I have tried cleaning with an electrical contact spray, similar to wd40, but so far no good. I picked up a lot of dried up black ink, so I will try a few more times, in case it still needs a clean.
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