Digital BW, The Print

I have a half full eboni black and prints are not showing  any sign 
of black. I lookred thru archives and messages all seemed  to be for 
other types of machines. Any simple sopiltion for getting the ink 
flowing agian. Puazzled by the  little hole on the side of the eboni 
cartridge that is not on the side of the  epson matte cartridge
jerry