We got ourselves a new HP Business Inkjet 2800 at the office which I got to install. All seems fine, the printer is correctly listed, and previews look good to me, until I eventually start printing. All I get from the printer is a blue/greyish box, no matter whether I print text or images (which only results in a larger box). I tried both the drivers from the included CD as well as the latest drivers from the HP homepage. It's a Mac Pro 2x2 GHz Dual Core Xeon running 10.4.8, if that helps.