Apple Watch
My series 3 Apple Watch vibrates but it's a black screen
Apple Watch Series 3, watchOS 8
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If you have charged your watch in accordance with the charging instructions (see link below), but still have a black screen even after pressing and holding the side button, try force restarting your watch: press and hold both the side button and Digital Crown for around 10 seconds, until you see the Apple logo.
If your watch does not restart, contact Apple Support or make a Genius Bar reservation with a view to having it serviced under warranty:
- Contact - Official Apple Support
More information:
Check your battery and charge your Apple Watch - Apple Support
If your Apple Watch doesn't respond or won't turn on - Apple Support