They then created “mini power supplies” power on your CPU, hard drive, Mac’s memory, keyboard, trackpad, and screen. When the SMC detects the power on command, it reaches out to the chipset, which creates a “ mini power supply” of different voltages (5V, 3.3V, 1.2V, 1.8V, etc.) following a specific sequence. When you initiate the power-on command by pressing your Power button or Touch ID, a series of complicated actions occur. The SMC is in charge of the MacBook power-on process. These components are pretty integral and have a connection of some sort with the part of the system responsible for power, so a fault could result in the MacBook Pro not turning on. Your MacBook is made up of these components, battery, logic board, keyboard, screen, SSD Drive.
If your MacBook Pro won’t turn on but is charging, then this is what may be happening.
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