There is probably something blocking the opening between the tank and the bowl. You may have to disassemble the tank from the bowl and look down into the opening on the bowl, under the tank. Remove all of the water from the tank with a small cup or bucket. Then remove the remaining water in the bottom of the tank with a sponge and unbolt the 2 or 3 bolts holding the tank to the bowl. Make sure you disconnect the water supply and shut off the water. Then you can inspect the hole in the top of the bowl the water flows into. Sometimes items become lodged in the opening and block it off.

Raymond VinZant Plumbing Prof.