This may be a repeat, I didn't see it here but didn't look real hard....(found this on another service)....
A small screw inside the scanner near the BNC antenna connector has been found to be loose on early production units. If it falls out, it can cause a short circuit and damage the scanner.
To gain access to the screw, remove the four long external screws and two short screws at the bottom of the scanner in the battery compartment. Carefully remove the rear cover and locate a small silver colored screw near the BNC antenna connector. Do not over tighten it and apply a drop of Super Glue or other glue.
Re-assemble the scanner and enjoy.
GRE is aware of this problem.