Are you using any kind of ink saving utility? If so disable it and see it that achieves anything.
In the print options dialogue for the Word document are you set for "Draft" output? Have you got all the correct boxes ticked in there.
In the printer settings do you have it set for "draft" or "economy", or something like that?
The angle I'm coming at this from is that a combination of the above may mean that it is printing, but all the various settings are conspiring to mean that so little ink is being used that nothing is coming out...
I did say I was stabbing in the dark!
As a work round if you're desperate for something quickly... assuming you can print from PDF documents, convert it to a pdf and print that. There are some free pdf converters... Cutepdf is one for eaxmple.