There are some steps here on how to soft & hard reset the watch. Not sure if you can get it to boot at all, but if you can the hard reset may help. This does erase all from the watch so you'd want to make sure you had a backup beforehand. Hope this helps.
Something I found on the interwebs. I'd start here if it applies to you.
First though try to restart it. This is usually effective in fixing devices that got stuck. If your watch has frozen or has become unresponsive, this may help. Here’s how it’s done: Start by unlocking your SAMSUNG Galaxy Watch Active. To do so, simply press the Home button at the bottom of the Watch face. From the watch screen, press and hold the Home button until the Options menu appears. From the Options menu, tap Power off. The device will now turn off. To start your SAMSUNG Galaxy Watch Active again, press and hold the Power button until the watch logo appears
If your watch's battery is completely discharged, it will not power on. You'll need to charge it before turning it on. If the watch will not power on or if it doesn't seem to charge, the problem could be anything from the battery, connection, the charger, or the watch itself. Give this link a try: https://www.samsung.com/us/support/troubleshooting/TSG01003100/
If you are still experiencing these symptoms, I would recommend a service repair. Can you please provide me with the following information in a private message: http://bit.ly/2JH2rq2
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