Iphone 4s still works but black screen?

My Iphone 4s somehow is not working properly. I know it still works because when I plug it in the computer everything is still works fine like how it use to, but the phone itself is just a black screen. I turn it on and off and the logo comes on and i can hear it unlock and lock when i unlock and lock it (with the black screen, I just approximate where the slide to unlock is), I hear notifications and all but its still just a black screen, I can't see anything. Does anyone know how to fix this?

I saw online some people had this issue before but I couldn't find any solid solution, I've placed it in uncooked rice, sunlight, used the hair dryer on low for a few minutes, still the same…

Try contacting apple.

I'm going to guess that the screen is broken and needs replacing. You can do it yourself, but it's a little tricky:

and you can buy the screen on sites like Amazon:
http://www.amazon.com/...005ZB5C98/