I've had my Asus x555lab laptop for around a year and a half and I've never had this problem before. When I watch a video on youtube after 5 minutes or so the screen will free and the laptop will make a buzzing noise which I think is what had been playing just before it crashed. Sometimes the rate changes like I was able to watch 25 minutes show on netflix then watched youtube for 5 minutes when it then crashed. I'm not able to click anything, move the mouse or even do ctrl alt del. I have to power off the laptop by pressing the button in order restart it. It has happened while watching a video on full screen and on normal size. It only happens when watching a video.I don't know what is wrong and I want to fix it as soon as possible