How do I turn the black screen back on with my apple watch?

Hi

Try force restarting your watch: press and hold both the side button and Digital Crown for around 10 seconds, until you see the logo.

If that does not help, next try charging your watch for around 2.5 hours, making sure that you follow the charging instructions here:

Check your battery and charge your Apple Watch - Apple Support

After that time, if it has not already restarted automatically, remove it from the charger and:

- Try restarting it (by pressing and holding the side button until you see the Apple logo).

- Next try force restarting it again.

More information:

If your Apple Watch doesn't respond or won't turn on - Apple Support

Allow the watch to charge for at least two hours then restart your watch.

Restart your Apple Watch

1. Press and hold the side button until you see the Power Off slider.
2. Drag the slider to turn off your device.
3. After your watch turns off, press and hold the side button again until you see the Apple logo

If you see the Apple logo, but the display otherwise remains black after restarting, check whether VoiceOver and screen curtain are turned on:

- On your iPhone, in the Watch app, go to: My Watch (tab) > General > Accessibility > VoiceOver > turn off VoiceOver.