Dead watch simple fix or repair?

Un pair the watch > Unpair your Apple Watch and iPhone - Apple Support

Then re "pair the watch.

Hi

Try charging your watch for around 2.5 hours. When charging your watch, check that:

All plastic wrap has been removed from both ends and both sides of the charging cable (check closely on the head of the charger).

• The back of your watch and the head of the charging cable are clean and dry (clean them with a nonabrasive, lint-free cloth).
• The charging head is properly aligned with the back of the watch, with the concave / curved side touching it fully:

  Some watch docks, stands, cases or protectors might hinder this.

• You are using a genuine Apple Magnetic Charging Cable or an Apple certified magnetic charging module.
• If you are charging your watch by plugging into mains power:
  • Check that the USB connector on the Apple Magnetic Charging Cable is pushed fully into the USB Power Adapter.
  • Try using different adapters from the following:
    • The genuine Apple USB Power Adapter that was supplied with the watch, or;
    • A genuine Apple 5W (iPhone) or 12W (iPad) USB Power Adapter, or;
    • An Apple-certified (MFi) third-party 5W USB power adapter.
• If charging via a USB port on a computer, ensure that you use a USB 2.0 or 3.0 port, the computer remains turned on and awake and the cable is plugged directly into the computer (not into, for example, an external keyboard).
• If your battery is very low, you may need to wait for a few minutes before the green lightning bolt appears (confirming that charging has started).

It is normal for your watch, power adapter and charging cable to become warm when connected to power.

Once charging has started, you can tap on the screen at any time to check on progress (allow a few minutes initially, in case the watch is charging from a very low battery level). A green lightning bolt symbol indicates that your watch is charging. It is normal for the screen to sleep again whilst charging continues.

More information:

Check your battery and charge your Apple Watch - Apple Support

After charging, if your watch has not already restarted automatically:

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

- Next try force restarting it: press and hold both the side button and Digital Crown for around 10 seconds, until you see the logo.

If you see the Apple logo, but the display otherwise remains black screen 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.

If the issue persists, contact Apple Support (mail-in service may be available) or make a Genius Bar reservation with a view to having your watch and power accessories checked under warranty:

- https://www.apple.com/support/watch/contact/

Carolyn Samit wrote:

Un pair the watch > Unpair your Apple Watch and iPhone - Apple Support

Then re "pair the watch.

To clarify: this is neither appropriate nor necessary (nor presently possible, if your watch does not turn on).