Hammer hit the cement wall do not move
The second reason is that the drill is blunt and try a new drill with a pointed point. The third reason is the high grade of cement wall, you need a big hammer out. The fourth reason is that the wall is too soft, hammer must be at the top of something hard to shake. The fifth reason is that if you hit a piece of it, it doesn't move. It's possible that you got the steel bar and change the position.
Why not move the hammer, the first reason is low voltage, small power, try to hammer the room "received air conditioners and refrigerators special socket.
First, make sure that the walls can be knocked out, not the load-bearing walls, beams, or columns.
