How could I turn my Mac OS back on, if it doesn't turn on with the power button?
Apple has a guide to triage when a Mac wont start, so I typically am methodical to read each step, perform them all in order - one by one.


https://support.apple.com/en-us/HT204267


When it says unplug all accessories, you do have to do all of them, even Apple accessories or things you know work since a good keyboard can still cause a failing USB controller in the Mac to malfunction. If you can get Your Mac to start after isolating it and still it panics before you can log in or get work done, follow the steps for a blank screen.


https://support.apple.com/en-us/HT210905