Iphone 4 screen turned black, but still responsive. What should I do?

My Iphone 4 screen went black yesterday afternoon. I can't see anything. It is still working, by that I mean it still receives calls and texts because I can hear the ringtone. My lock button jammed a few weeks ago, so I can't turn it off/on. Is there anyway I can get the screen to work? I'm going out of town tomorrow afternoon so if you could help me As soon as possible, that would be great!

The exact same thing happened to me. :/ I don't think there's anything you can do. If your lock button was working then you could reset it by holding it down along with the home button, but I guess that's out of the question. All you can do is take it to the apple store.

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