Black screen
My watch has a black screen but still works
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Check to make sure that Theater Mode is not on. Tap on the screen, and if you see the theater masks icon in the top center, you will need to swipe upwards and turn that off.
IF the screen is black and you cannot do anything else, then reset the watch. Hold the Digital Crown and power button together until you see the Apple logo and then release. The Watch will reboot.