Yes, there are a few ways to potentially power on an Early 2015 MacBook Air even if the physical power button is not working. The ability to use these methods depends on the nature of the power button failure (e.g., if it's a software/SMC issue or a hardware failure like a faulty keyboard/logic board).

Troubleshooting & Alternative Power-On Methods

Here are the common alternative methods and diagnostic steps, ranging from easiest to most complex:

1. The MagSafe Charger Auto-Boot

On many older Mac laptops, including the Early 2015 MacBook Air, the Mac is designed to automatically power on when you connect it to the MagSafe charger, if the laptop is completely shut down (not just sleeping).

• Action: Ensure the Mac is completely off (if you can tell), and then plug in the MagSafe charger.
• Outcome: If the Mac's logic board is functioning correctly and the issue is solely with the power button mechanism, it should turn on.

2. SMC Reset (System Management Controller)

A non-responsive power button can sometimes be caused by a glitch in the System Management Controller (SMC). Resetting the SMC can resolve power-related issues.

1. Shut down your MacBook Air completely.
2. Plug in the MagSafe adapter to a power source.
3. On the built-in keyboard, press the Shift-Control-Option keys on the left side and the power button (which is part of the keyboard) at the same time.
4. Hold all four keys and the power button for about 10 seconds.
5. Release all keys and the power button at the same time.
6. Press the power button normally to turn on your Mac. (If the physical button is completely broken, you may need to rely on the MagSafe auto-boot after the reset).

Note: The LED on the MagSafe adapter may briefly change color or turn off when the SMC is reset.

3. Hardware-Level Solutions (Advanced)

If the issue is a physical break in the power button or its connection, the following methods are much more technical and require opening the laptop, which is generally recommended only for experienced users or repair professionals:

• Keyboard Disconnection: On models like yours, the power button is part of the keyboard. If the keyboard assembly has liquid damage or a short, it can prevent the Mac from booting. Disconnecting the keyboard cable from the logic board may allow the Mac to boot via the MagSafe charger auto-boot feature (Method 1).
• Power On Pads (Pads/Jumpers): On the Mac's logic board, there are two tiny contact points, or "pads," that can be "jumped" (bridged with a conductive tool like a metal probe or tweezers) to manually initiate the power-on sequence. The location of these pads is specific to your Early 2015 MacBook Air model's logic board. This is a common technique used for diagnostics and component-level repair.