I've just updated my 2012 MacBook Pro to macOS Mojave but it won't boot (the caps lock light won't turn on and off.)

So I've try to hold CMD+R during the boot but it asks me for a password, but I don't remember having set a password in the past. Does someone have a solution? Also I want to know if the password box is in qwerty or azerty (normaly my mac is in azerty.)

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    will it start in Safe mode – Ruskes Oct 14 '18 at 19:18
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    Nope it won't boot – Doctor Pi Oct 14 '18 at 19:22
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    If it literally will not turn on, I'd reset the SMC. Failing that, take it in for service. The Mojave update and the failure happening at the same time were likely coincidence as a software update almost never causes that kind of (hardware) failure. – Steve Chambers Oct 14 '18 at 19:45
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    you said, it does boot up to the Login password, so what does it do in Safe mode ? and we can not provide you with your password. – Ruskes Oct 14 '18 at 20:19
  • It is the EFI password which is asked indeed – Doctor Pi Oct 14 '18 at 20:24

I've solved my problem, I've simply deleted the content of the folder /Library/Extensions

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