Shut down your Mac, then turn it on and immediately hold down these four keys together: Option, Command, P, and R. Keep holding the keys for about 20 seconds, during which your Mac might appear to restart. To reset your NVRAM of your Macbook follow these instructions from the Apple website: You can find more about it on the Apple website here. The NVRAM is a small amount of memory which stores certain settings like sound volume, display resolution etc. To get it working again you have got to reset the NVRAM. So the only thing I saw on the screen was the blue logo like this:
After several tries I started Googling for a solution, eventually I found a working solution which I will share with you guys. It was stuck on the blue Windows logo and nothing happened.
So now and then I use a Windows 10 installation on my MacBook Pro (13 inch 2015), but this time I wanted to use it but it didn’t boot.
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