Hi Seal245,
To clarify, does your Apple Watch also not power on? If so, take a look over the tips here:
If it does power on, but you're unable to pair it, what specifically happens when you try following the pairing steps here?
"Turn on, pair, and set up your Apple Watch
- Put your Apple Watch on your wrist. Adjust the band or choose a band size so your Apple Watch fits closely but comfortably on your wrist.
- For information about changing the band on your Apple Watch, see Remove, change, and fasten Apple Watch bands.
- To turn on your Apple Watch, press and hold the side button until you see the Apple logo.
- Bring your iPhone near your Apple Watch, wait for the Apple Watch pairing screen to appear on your iPhone, then tap Continue.
- Or open the Apple Watch app on your iPhone, then tap Pair New Watch.

- Tap Set Up for Myself.
- When prompted, position your iPhone so that your Apple Watch appears in the viewfinder in the Apple Watch app. This pairs the two devices.
- Tap Set Up Apple Watch, then follow the instructions on your iPhone and Apple Watch to finish setup."
If you've used this Apple Watch with a previous iPhone and instead are trying to pair it to a new one, follow these steps instead:
Cheers!