Ive got an HP 6515 photosmart printer, rarely use it, but normally it works great. Recently, I dont know what I did to my settings, an upgrade, or ??? but now it will NOT print black in for documents or pdf files without me changing the paper/quality or (Media) to "HP Everyday Photo paper Glossy" - prints great on pictures on the 4x6 picture slot. Prints colors, even prints in grey scale when trying to print normally. But, for some reason, after re-installing, re-booting, cleaning the print heads, changing the cartridge out, whatever...it just wont print in true black. This also goes for copying straight off the device. I actually had to go in a change the paper setting on the printer to glossy paper for the scanner/printer to print out black.
Ive called customer service...after 15 minutes of trying to spell out my email address to the english challenged tech, I gave up when she told me their solution was to "buy a new printer". C'mon now. Obviously it works...sort of.