My watch has a completely black screen and even a forced restart doesn’t do anything . Any ideas ?
What to do if forced restart doesn’t work ? Screen just black
The article If your Apple Watch won't charge or it won't turn on - Apple Support including the advice to Force Restart near the end of the article is the best resource for this situation. If you've completed that troubleshooting and the issue is still not resolved, use the link in the article to Contact Support. Or Genius Bar Reservation and Apple Support Options - Apple
(Note that recent Watches without plastic protective packaging do not usually have film over the watch back or charging puck).
How to charge an Apple Watch
Wear it all day, charge it all night.