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HP OfficeJet Pro 8710 All-in-One Printer

The printer had not been used for some time.  The old cartridges gave the message that I had to subscribe to the HP ink service to continue with those cartridges.  So I bought and installed a complete set of genuine HP ink cartidges ($$$$).  I noticed some lines on the black text of the printout so used the printer maintenance feature to clean the printhead.  Tried  three times. The following error message came on when I tried cleaning the printhead a third time:  "There is a problem with the supply system. Try replacing the affected cartridge with a different non-empty cartridge."  One cartridge is highlighted, in this case the magenta. The message persists and printer is locked out.  Is it a problem with the ink cartridge or printhead?

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