I take it you unplugged it for a while and plugged it back in with no results? Then maybe you reseated the print head with no results?
Maybe you can find a replacement print head, but if it's from HP it may cost about as much as the printer. Maybe you can find a same model of printer used from somewhere, and put the print head in yours.
All printers suck, but inkjet printers suck more. Next time, especially if you can do without color, the black laser jets are now of comparable price to the color inkjets, and the replacement toner is just about always a better value than ink cartridges, especially if you only need black.