Summary
If your Mac won't turn on, make sure the power cable is undamaged and plugged securely into your Mac and a working electrical outlet.
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If your Mac has no built-in display, make sure the external display is connected to power, connected to your Mac, and turned on.
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Press and hold the power button on your Mac for about 10 seconds.
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Additionally, if the screen is black on startup, the battery power circuit may be the cause.
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Finally, if the screen is stuck on black, the battery may be faulty.
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According to
Summary
Make sure that your power cable is undamaged and plugged securely into your Mac and a working electrical outlet.
If your Mac has no built-in display, make sure that your external display is connected to power, connected to your Mac, and turned on.
Press and hold the power button on your Mac for about 10 seconds.
If your Mac doesn't turn on - Apple Support
apple.com
Summary
When a Mac won't turn on, there are a number of ways to troubleshoot the issue, such as checking the charger's cable, starting the Mac in safe mode, resetting NVRAM, and fixing a Mac booting to a black screen. Additionally, if the screen is black on startup, the battery power circuit may be the cause. Finally, if the screen is stuck on black, the battery may be faulty.
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