After I updated to windows 8.1 when I boot up my computer it won't turn on. It displays the dell boot up screen and the windows boot up screen then it goes black. When it's black I have to hit the power button then wait for it to sleep then hit the power button again then it turns back on and let's me in my screen. I just wanted to know if anyone knew how to fix this because it is agitating and I want to sell my computer and get a new one. So if anyone knows how to fix this i'm open for ideas.