G2000 printing colors are way off

I've had a G2000 for a good while now, but have been using it only for b&w documents - been awhile since I printed a color pic - but what is supposed to be red is coming out a sickly yellow-green and my grey is a weird blue-green.  My ink bins are all at least halfway full.  Troubleshoot says I don't need a driver update.  Any ideas?  Thanks.   (The "ACK" in the pic is supposed to be red, and the color of the bit of werewolf you can see should be slate grey)