thomas fraser Agree with @lpfaff1 on checking the battery and contacts first. Make sure that you have a good battery. After that you will have to disassemble your camera and check the switch. The battery connects to the DC/DC converter on your board so that is where the trouble could be as well. There are are two fuses (labelled FU101 and FU102) on the circuitboard, check to see if those have continuity. You will need a multimeter for all the testing. Let us know how far you want to go with this so we can try to continue to assist you.
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