If there is a power problem, you may need to reattach wires to the battery compartment or replace it completely. If the problem is Corrosion, just see the guide on corrosion.
Unscrew the large metal screw on the left side using a quarter and remove the battery cover.(Picture not available)
Use a 00 Phillips head screwdriver to remove the small screw on the far left of the battery compartment.
Pull up on the tab to remove the batteries.
Use a 00 Phillips head screwdriver to remove the four screws from inside the case.
Remove the battery compartment from the camera.