Apple Watch screen not working
Face of watch is black. Not responding even if fully charged & also turned off. What to do
[Re-Titled by Moderator]
Did you try to force restart by pressing and holding the Digital Crown and the Side button together for about 10sec, until the Apple logo comes back again?
Also check the troubleshooting in this article:
If your Apple Watch won't charge or it won't turn on - Apple Support
In case this does not work, you will have to get the watch serviced:
Apple Watch Service and Repair - Apple Support