It's possible the watch just has a dead battery, start with plugging the watch in to charge. If the watch still will not turn on try purchasing and installing a new battery. If these don't work the watch might have a deeper issue like a broken power button or screen.
Check to see if there is debris inside the power button's opening that is obstructing the button from being pressed down. If still not working, there may be an issue with its interaction with the battery and motherboard.
It's also possible the LED display might not be working. Look closely at the screen, if the pixels are not illuminated you might need to replace the screen.
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Check out the [https://www.ifixit.com/Wiki/LG_G_Watch_R_Troubleshooting|LG G Watch R's troubleshooting page] if you require further help.
It's possible the watch just has a dead battery, start with plugging the watch in to charge. If the watch still will not turn on try purchasing and installing a new battery. If these don't work the watch might have a deeper issue like a broken power button or screen.
Check to see if there is debris inside the power button's opening that is obstructing the button from being pressed down. If still not working, there may be an issue with its interaction with the battery and motherboard.
It's also possible the LED display might not be working. Look closely at the screen, if the pixels are not illuminated you might need to replace the screen.