Digital BW, The Print

Ok, I got and Imac, and install photoshop CS4... if I go and print in color I have no problem to follow the normal workflow I used to do, but if I got the Advance Black & white option ( wonderful black & white... when I hit print the print spool for a couple of minutes, and then  banish... it never get print.... I belive this was a problem with me, my network and the 12 imacs I have... but no, have the same problem with a friend that have his Imac, on the printer ( same one I have ).... and the same problem happen.

 Any idea??

 juan