Does the test print work? You didn't tell. Just a FYI, my C80 did the same a few months back. It's dead and gone. Repair costs more than a new printer.
I'm running XP home and recently replaced all the color cartridges in my C84 at the same time. The next time I printed I got no color ink on the page. I've tried reseating the cartridges several times. I've cleaned the nozzles about 6 times. I've left the printer turned off overnight. I still can't get any color ink on the paper. The printer utility recognizes the cartridges and shows them all as being full. Any ideas on what to try next?