Hi everyone,
I have a friend's Dell Inspiron 15 Laptop. It can't boot into anything. I have tried using a Windows USB stick, but it just goes to a blank screen. Even automatic repair won't boot - It just says preparing then fades to a blank screen!

Is there anything that will fix this?

(P.S. I have not tried a Windows DVD, as I don't want to buy one unless there is a good chance it will boot.)