Digital BW, The Print

I'm using a MIS VM CIS on and 1160. I installed the system with no 
problems and having been getting the hang of printing. There is still 
a great deal of ink in the bottle -- almost full -- and the connect 
tubes seem to be full also. However, I'm getting a message from my 
printer software that I am running out of ink, but only the color 
inks. Is this a hardware problem -- in other words, could I be having 
problems getting ink to the cartridges? If so, how can I safely 
verify that this is the case? Or is this a software problem related 
to the CIS being misread by the printer? Any help would be greatly 
appreciated.

Chris Hargens