Sometimes while you are fishing for Crappie in the middle of the winter the crappie just wont bite. If this is the case then try a technique called dead sticking this is where you just set your rod down and watch for the strike. Every once and a while you can flick your line to see if this wil trigger the response. This usually will happen with in the first 30 seconds after you flick the line.
Just a disclaimer dont do this during just any time of the year as I have heard many stories of spring, summer, and fall white bass dragging your equipment right into the water.