My MacBook won’t turn on

Read and follow all the steps in If your Mac doesn't turn on - Apple Support.

The referral post is Apple definitive solution. It didn't work for you? Note the admonition to contact Apple Support if it didn't.

If your Mac doesn't turn on - Apple Support

Follow all the steps, all the way through to and including the end.

If your Mac doesn't turn on - Apple Support

What is Apple Support tell you?