My HP Officejet Pro 6960 is not printing in CYAN even though the cartridge is nearly full. I have run the print quality diagnostic page and both the other colours + black and the alignment are fine just there is no Cyan colour printing. I've cleaned the print heads about a dozen times but that doesn't seem to make any difference. Suddenly started happening about a month ago and have replaced the Cyan cartridge with a new one since but still no Cyan is printing. Any ideas anyone, please?
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