I have to turn it on and off 3 or 4 times until it starts, then it's going very well, I do not know what it can be, I'm uploading a video to show you, sorry for my English
i've a computer having something like that. in my case, it's because the gpu drivers are not stable.
you can check it by pressing ctrl+alt+f3 (or f2) when it doesn't work to see the error message
when it is freeze, it does not allow to press any button