MacPro won't turn on

Hi,

Following document could help your issue.

If your Mac doesn't turn on - Apple Support

If it doesn't help, and if your MacBook Pro turn on when you connect charger, try to run Apple Diagnostics if it reports battery related error.

Use Apple Diagnostics to test your Mac - Apple Support

Apple Diagnostics reference codes - Apple Support

Burnhamconsult Said:

"MacPro won't turn on: I have just had the battery replace a month ago and now my Mac won't turn on and I have plugged it in"

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Perhaps this is a Faulty Battery?

Where did you get this battery replaced? Take it back to the location that replaced this, and request a new battery. It almost seems like a faulty battery was placed in there.