Garmin Oregon 600 GPS power switch replacement

Hi @johns23099

Use an DMM (digital multimeter) to check that it is actually the power switch that is not working and not that it is a problem with a worn/broken rubber power button actuator (supplier examples)

Here's a teardown video that should help you to access the switch to check what the problem is i.e. switch or actuator button

Not sure as I can't see it too well in the video whether the power switch is an electrical switch on the motherboard or a tactile button on a flex cable connected to motherboard that is operated by the rubber button,

If it is the switch, post an image of the board (or flex cable) showing the switch. Here's how to do this on ifixit Adding images to an existing question