My Apple Watch Series 4 has stopped working. No screen even after charging.
My Apple Watch Series 4 has stopped working. No screen even after charging.
Apple Watch Series 4, watchOS 9
If you followed all the steps in this article:
If your Apple Watch won't charge or it won't turn on - Apple Support
then your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple
or if you still need help, contact Apple Support.