A MacBook consists of the following components: a screen, keyboard, touchpad, battery, SSD drive and a logic board. The System Management Controller (SMC) governs the entire MacBook power-on process.Īny 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. 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. 5V, 3.3V, 1.2V, 1.8V, etc.) in a precisely defined sequence. 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. You need to make sure your MacBook is receiving power from either the MagSafe or USB-C charger. I talked to two people, the last of whom HUNG UP ON ME when he realized that I was not going to. Wait for your Mac to shut down and press the Power key again. Hold down the Power key for about 6 seconds. It might help, but if it doesn’t, in no way should you panic first, let’s perform a quick force restart. Called APPLE SUPPORT, as I had done in the past as a long time Apple user, and was SHOCKED by the AWFUL customer service. Try to open and close the MacBook lid and press a few keys on the keyboard. Check if the power cable is undamaged and securely plugged into your Mac and a working electrical outlet. I have an 18 month old Macbook Pro 13'' that won't boot, but instead it just beeps 3 times (a RAM issue).
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