TS1367 after a software update, my macbook pro was supposed to restart, since then, it doesn't restart & there is nothing i can do, any help please ?

Hello,
after a sofware update, my macbook pro was supposed to restart,
since then the start up process begins & after few seconds, the mac goes back to off without starting, what's wrong ?
thanks for any support,
Amine

Let me add a little bit of details,
after the software update, I was asked to restart my laptop,
while doing it, I got a message error :"some files couldn't be updated".
Since then, everytime I start my macbook pro, I have the grey apple & screen, with a kind of updating bar (grey as well) at the bottom,
when the bar reaches approximately 30 to 40%, it disappears & the laptop swiths off.
Ihave tried to start on a safe mode, it doesn't work either,
thanks

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