Hi, i'm on windows 8.1 preview,

every time i turn my pc for the first time it gives me only a black screen with the cursor on it, and then when i turn it off and on again it boots normally, i reboot and turn off again and it works perfectly until the next day when i try to use it it gives me the black screen again, and i have to turn it off and on for it to work.

Very weird problem, does anyone know how could i fix it?

I'm new btw and i apologize if it's the wrong section