Make sure your cable is working : If you don’t see any charging light on your Mac, it could be because of a faulty power supply. Try charging it and turning it on before moving to the next steps. Check that the Mac has a battery: Make sure your laptop’s battery isn’t completely drained. If there’s no startup chime or noise from the drive or fan, or no visuals on the display, here’s what you should do: If you have an older model, the MagSafe cable will show an orange light if the laptop is charging and a green light if it’s charged. So before doing anything else, press the power button. While this is very obvious, you should check the power connections and the battery just to check this off the list of possible causes. The following are some fixes you can try to determine the cause and hopefully solve the issue! – Check if Your Mac Is Turning On There can be various reasons for your MacBook Pro or Air not turning on, but it’s a little tricky to figure out the exact cause. The problem can be because of a single malfunctioning component, which can be something like a faulty display, a failed hard disk, or even problems with the System Management Controller. Whether you have a MacBook Pro or Air that fails to turn on, the problem is hardly ever with the whole setup. This often happens because of some glitches from a recent macOS update. 
Sometimes, your MacBook doesn’t respond when you press the power button. Some errors can cause the internal temperature of the device to exceed normal operating temperatures, causing the system to automatically turn off to avoid further damage. One of the most common reasons for a black screen or a MacBook that won’t turn on is overheating. If your MacBook refuses to turn on, whether that’s a MacBook Pro or Air, there can be a number of possible reasons, including overheating, update glitches or other uncommon reasons that can be easily fixed.
– My MacBook Air Won’t Charge or Turn On, What Do I Do?. – How To Turn on a MacBook Air Without Using the Power Button. 
– Why Is There a Black Screen on My MacBook Air?. 
My Macbook’s Screen Went Black and Won’t Switch On, What Do I Do?.
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