Apple Watch will not complete boot up

Hi Meganweekes,

We have some steps that should help If your Apple Watch won't charge or it won't turn on.

If your watch requires charging, a red lightning bolt  appears on the screen. (You might need to click the side button to see the watch face.) When your watch is charging, the red lightning bolt  changes to a green lightning bolt . If your screen is blank or you see the charging cable icon and a red lightning bolt  on the screen, charge your watch for up to 30 minutes. 

These steps could help as well:

"Get help

If you use a third-party charging stand, use the charging cable that shipped in the box with your Apple Watch.

If your Apple Watch won't charge or you see a message on your watch that charging with this accessory isn't supported: 

1. Make sure that you plug the Apple Magnetic Charging Cable or USB-C Magnetic Fast Charging Cable all the way into the USB Power Adapter, then make sure that you plug the adapter all the way into a power outlet.
2. Make sure that you're using the Apple Magnetic Charging Cable or USB-C Magnetic Fast Charging Cable that came with your Apple Watch. 
3. Completely remove any plastic wrap from both sides of the charger. 
4. 
5. Make sure that the back of your Apple Watch and the magnetic charger are clean.
6. Position the back of your Apple Watch on the charger. The charger's magnets align your Apple Watch, and you should see a green lightning bolt  on the watch face.
7. If your Apple Watch still won't charge, force it to restart. Press and hold both the side button and Digital Crown for at least 10 seconds, or until you see the Apple logo.
8. Try a different Apple Watch Magnetic Charging Cable or USB-C Magnetic Fast Charging Cable, and a different USB Power Adapter. If your Apple Watch is out of power, you might need to wait a few minutes for the green lightning bolt  to appear after you start charging your device."

Let us know how it goes. Take care.