My iPad 2 won't turn on.

My iPad 2 won't turn on, it has a full battery and has been working fine. I had the screen replaced about two months ago due to accidently cracking it, im not sure if that could be a reason why it won't turn on but its a possibility. I tried to reset it and the first few times it didnt work, but then it turned on and was working fine. After being on it for about an hour it stops working again. I've been charging it (even though theres a strong battery) in hopes that would help, but i've had no luck. Resetting it won't do anything either, any advice? Thanks(: