odometer failure. what can cause this. odometer indicator does not display mileage.

won't display,blink or come back on at all? tried smacking the dash? when did it go off? try this>>Disconnect battery and touch the cables together for 10 minutes with battery disconnected,NOT THE BATTERY POST,JUST THE TWO CABLES(touch the two cables together> positive and negative cables,and hold together for ten minutes),then hook the battery back up.see what happens..