It's like this. HP K5400 will not print in b/w or color if any one cart is empty. In my case yellow cart is empty. Other carts are almost full. I want to use the printer for b/w printing, that is, use the black cart only. How do I do that? Not possible by setting it to print in b/w mode. When the printer is powered up it does a check and reports an error because one color cart is empty. I need to know how to bypass this check!