Print quality terrible, may not be the printer - how can I fix it?

I've been cleaning and replacing cartridges in my printer lots but no improvement of print quality, in fact a deteriation so that now only magenta and a tiny bit of black print. I just used someone else's printer and same problem (different colour error though) but printed using their computer and the printer is fine. Could there be something I need to change in my mac rather than from the printer to solve this?
I have a MacBook Pro 13" and my printer is HP 8600dn, which has worked fine for 2 years.
The second printer which I can't print on but does work from another computer is the Epson Stylus SX420W.
I've just put new HP cartridges in and it's claiming to have finished the yellow despite me not seeing any yellow being printed.
Can anyone help?? This is driving me crazy and I really need my printer! Thanks, Eve

There are alterate drivers in OS X for each of those printers. Try Generic PCL 6 for the HP and the Gutenprint driver for the Epson. - in other words, add the printer again, but select the alternate driver.

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