This problem has occurred from 1 week ago, my laptop sometimes stuck at boot, but i managed to get it boot properly from power it on, wait 5 minutes at the samsung logo(stuck at boot) , power it off again, and lastly, power it on again. But, after a week, this doesn't work anymore. My laptop also overheat often. Hope you guys can halp. And i cant get to bios setup or whatever because of the F2 and F4 button doesn't work.