Question about HP DesignJet 755cm InkJet Printer

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755cm HP Printer will not print black. grainy dotty prints.

Hi, When I recently purchased a 755cm all colours and black seem to print fine, I am now having a major problem..... All cartridges are full, it recognises all cartridges but it will not print any black. The images I am sending to the printer are coming out filled with little dark dots looking very grainy. I printed a test page and put a different black cartridge in but it still the same, the printer recognises there is a cartridge in but it will not print black!! I have cleaned the printer and cartridge strips but still not joy.... It was working fine two weeks ago, Although I was only printing text so not sure if it will still be dotty and grainy even if the black does get fixed. Please help....... All possible answers welcome, I need this printer working.... Thanks.

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  • tom cave Jan 18, 2013

    Is it the print head? Is it the settings? Is it the ink cartridge (tried 2 different ones)???

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