My laptop stuck on a blank screen with a blinking white underscore, help please!?

Well all I did was turn my laptop by the start menu then I turned it back on the next day, it went straight to the blank screen with the white blinking underscore. I've tried everything, from f123456789101112, to unplugging my laptop taking out the battery holding the power on for 30 to 2 minutes putting the battery back in & pressing the power on & still nothing. Please help me out here, I can't afford to get a techniction to fix it for me so please help. :[