What would cause a Macbook Pro to refuse to open up?

DrSprockets wrote:

What would cause a Macbook Pro to refuse to come on after running down the battery and then putting it on charge?

ref: If your Mac doesn't turn on

If your Mac doesn't turn on - Apple Support

see If your Mac still doesn't turn on, contact Apple Support.

If your Mac doesn't start up all the way

If your Mac doesn't start up all the way - Apple Support

Get help with your Mac notebook battery

Learn how to optimize the life of the battery in your Mac notebook, fix battery issues, and get service.

Get help with your Mac laptop battery - Apple Support