It's the fuse.
Get a 5x20mm BP/GMA 500mA 250v
Procedure:
- Remove battery screw and cover
(PH1 Phillips)
- Remove 4 backing screws
(2 under the "AAA" batteries & 2 in top back)
- Gently pull apart in half @ seam
(Careful to not pull battery wires)
- Remove Fuse & Replace Fuse***
- Reassemble in reverse order.
* You can easily verify its the fuse by placing something conductive in the fuse socket in lue of the fuse, put batteries in and test continuity of fuse and connectors. Make sure black lead is connected into the middle socket and the red lead into the right socket.