Check if the power cable is undamaged and securely plugged into your Mac and a working electrical outlet. You need to make sure your MacBook is receiving power from either the MagSafe or USB-C charger.

If the SMC has not received power, failed to function, or failed to create the required “mini power supplies”, your MacBook won’t turn on.įor deeper technical details of the MacBook power-on process, see our article How does my MacBook power on? These “mini power supplies” will power your Mac’s memory, hard drive, CPU, Wifi, keyboard, trackpad and screen. 5V, 3.3V, 1.2V, 1.8V, etc.) in a precisely defined sequence. Once the SMC detects that you have pressed the power button, the SMC will co-operate with the Intel chipset to create a series of “mini power supplies” of different voltages (e.g. The System Management Controller (SMC) governs the entire MacBook power-on process.

Any of these components gone wrong could cause your MacBook won’t turn on.įrom the moment you press the power button or Touch ID button to the MacBook displaying the image on the screen, your MacBook has gone through a series of complicated power-on events. A MacBook consists of the following components: a screen, keyboard, touchpad, battery, SSD drive and a logic board.

Macbook pro 3 beeps not turning on