Your Apple Watch does not boot up can be caused by the following reasons:
- Your watch is out of battery. The most obvious reason for this issue is your watch is running out of power.
- Your charger isn't working properly. If your watch is charging up but still not turning on, your charger may be corrupted.
- Your watch is frozen. Your watch may get stuck on a black screen due to an outdated watchOS version or a glitchy app.
- Your watch is in Power Reserve or Threate Mode.
You described that you have tried hard reset and kept it charging, but it still not turning on, so you can try the below methods to fix it.
- Check your charger and outlet. Make sure your charger and outlet are intact. Your device is charging when a lightning bolt appears on the screen. If this does not occur after a few moments, you may have an issue with your power supply.
- Turn off Power Reserve or Threate Mode. To turn off Power Reserve Mode, press and hold the side button until the Apple logo appears, then wait for your device to restart. To turn off Threate Mode, tap your display, swipe up to open the Control Center, and tap the Theater Mode icon.
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