When performing a factory reset, system restore, and firmware update, you may connect or charge your iPhone to a power outlet to ensure no power interruptions and wait for the device to complete the entire process to prevent causing any damage to the phone system or hardware itself.
If it works, one of your accessories probably may not compatible with the current version of MacOS. Then simply hold down your MacBook power button and count for ten seconds.
For example, if your Mac has GB of memory, your startup disk must have at least GB of free storage space for Windows. Then release, and press the power button as you normally would to turn the Mac on.
If you know of another good way to discover this information, share it with us in the comments below! If you are not sure of what exactly is causing the boot loop, try to delete Cydia Substrate instead.
Select a back-up to restore from or a new version you prefer. Release both buttons. Steps to calibrate your iPhone 6 battery Note: Do not use your phone while charging.Even if it looks all right, try to find a compatible MacBook charger and switch out your charger for this model to see if it works. In fact, this is a widely recommended trick to deal with apps-related problems occurring on various iOS devices. This can often help fix issues that prevent MacOS from fully loading. It would take a little longer for the lock screen to appear. Before you begin, unplug anything attached to your MacBook. Open iTunes on a computer Mac or Windows. Remove all third-party mice, drives, and other accessories. This works if your Mac at least tries to turn on, but it may not be effective on a totally dead MacBook. Just scroll down a bit, if you want to give them a try. Otherwise, take it to an authorized technician for physical repair or restoration. First, try switching to different outlets to see if your current outlet is faulty.