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hello .. need help. i have Hp ProBook 4520s  . today i hibernate my laptop and after i came to turn it on it gave me the restart problem ... cant enter F8 . tryed to format windows aswell but still the same . tryed also turnin on without battery and to hold the power buton for 15 sec .. any help 

https://www.youtube.com/watch?v=gXI8Iwi9X1I

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