I watch 3 screen become dark right after charging
when start charging Apple watch 3, but just charge on, then screen turn off?
even take charge if off, screen still dark, unable to get screen back?
Apple Watch Series 3, watchOS 7
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Hmmmm, are you seeing any screens like the ones shown in here?
If your Apple Watch won't charge or it won't turn on - Apple Support
Several good suggestions included there, including hard reset.