how do i retrieve my files from mac book pro

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

Are you an iCloud Drive user? If so, then whatever you have there is reachable. Or you can access them from your backups.

And, there is this: https://www.howtogeek.com/728422/how-to-get-your-data-off-a-mac-that-wont-boot/

Give the details on what your issue is and maybe we can come up with the root cause and offer a solution.

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