I use samsung laptop. Suddenly my laptop screen went blank. And on top of the keyboard there 4 icon listed which is power on, recharging, lock with A inside it and lock with an F. there’s light showing up at icon power on and lock with F inside it. I belive since i use it there nvr light showing up at icon at lock with F inside. What should i do? All my assgmnt that i need to submit by tomorrow is inside! Help me!