I tried to fix my grandparent's Lenovo Ideapad U460. The screen started flashing when we're trying to use it. But I can temporarily fix the flashing problem by adjusting the brightness of the screen (by pressing Fn + "a bright sun"). But it then dims back down to about 50% brightness then it starts flashing again. I'm guessing it's a hardware problem, but I'm not ruling out software problem either because the laptop has a lot of ad-wares installed... Would you please point out the problem? I'm hoping to help them fix it. Thanks!
Flashing problem: http://youtu.be/L5hZI8Ytxiw