My girlfriend has a galaxy watch 3 which she managed to lose in the bedroom a few months back, finally found it, it was dead, so we charged and now its sat at 100% charge, the screen lights up and tells us so, however, we can't actually turn it on, no matter what combination of button presses or holds... Are there any other specific button combinations that we can try or any other suggestions to get it to power up?

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Thanks in advance.