not able to print in color after changing cartridge

Hi.

Using a Mac OS X 10.6.8 with an HP Officejet J6480 printer. No problems in the past but just changed both black and white and color cartridges (new- not refurbished) and it's not working. When I look at a preview it's also only in B&W. I've tried deleting the printer in preferences and then adding it back with no success. (when I ran a color test on the printer it worked fine (printed in color).

Any ideas?