I can't boot the Apple laptop, and it's always restarting. What should I do?

1. Restart: Control + Command + Power button, hold for 3 seconds.

2. Reset PRAM: After pressing the power button, press and hold the following keys at the same time: Command + Option + P + R until you hear at least one startup sound after the initial startup sound.

3. Reset SMC: Turn off the computer and connect the power adapter, please click (left) Shift + Control + Option + power button