Hi there,
My HP Officejet 6000 has been working well for about a year until today, where it started printing light grey instead of black.
My officejet is attached via USB directly to my PC, I am running Ubuntu 12.04 with gnome shell. Printing used to work well out of the box. I just installed HPLIP Toolbox to see if I can fix anything, but that was no help. I exchanged the black inktank for a new one, but that did not help either. The grey looks like perfect grey, and not some faded faulty drying out black. I tried switching the color output mode in the printer settings to black only greyscale, and the printer did not print any ink at all. Is this an software problem? Or a printer hardware problem? I tried printing from my laptop and had the same issue.
Any help would be much appreciated.