Apple Watch is not working
I have a Apple Watch 3 and start green light in the bottom and after all screen came the same color and after that when off I charge it but is not working since that
Apple Watch Series 3, watchOS 6
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If possible, the first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup if possible. This deletes all temp and corrupted files and re-indexes the file system.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support
Or perhaps this article will help:
If your Apple Watch won't charge or it won't turn on - Apple Support
If you still need help, contact Apple Support.