

Make sure that all such devices are connected and installed correctly. Installing new RAM or HDD might also be the culprit of your Mac not turning on. Your MacBook Air Won’t Turn On when you have some faulty peripherals connected to your system, and they might interfere with the boot-up sequence.
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See also: How to Clean MacBook | Top 9 Methods (Both Air and Pro) Disconnect Accessories & Peripherals Sometimes a power surge might be the reason behind the damage to your cord. If your Mac turns on, it means that your default charger cable has gone kaput, and you need to find a new power cable. Try charging with Mac with a spare cable if available. The fault might be with the power cable.Try charging for a little while before and see if that helps.

Try to be sure that the battery isn’t at fault or that it isn’t dead.
