I have an all-in-one HP OfficeJet 6500 printer/scanner/copier/fax. It uses 4 cartridges (C, Y, M, K). I have only used original HP cartridges. The black (K) cartridge has about 20g of ink left and the printer is reporting that it is nearly full.
Just recently the black part of the print faded as if the ink has run out (it hasn't - 1st paragraph) and now if I print a page the black elements are non-existent whereas colour ones are fine - that's whether I print something from a PC or use one of the printer's own status reports.
I'm not sure whether the issue is with that cartridge or did the printing head clog or something. I told printer to clean its heads but that didn't help. What can I do / try?
I have ordered a new black cartridge, should get it next week. If it is the cartridge issue that should help...