I am having the same issue, my S3 Gear won't turn on. The battery shows 100% charged on the charger, and the charger has the green light.
I've tried all the above mentioned possible solutions and none of them have worked. Out of desperation, I decided to change the battery, hoping that would fix it, but no luck. The watch is doing the same exact thing. The new battery came charged at 65%, so I waited until it was charged at 100% but the watch won't power on. I bought the watch a year and half ago and paid over $300. I sure got a bad deal with this Samsung watch.
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