IPhone 4S screen won't light up?

My iPhone 4S screen won't light up. When I receive a text it vibrates and makes a noise like usual, but the screen stays black. I've tried holding down the home and sleep buttons at the same time to turn it off and then back on, and I also plugged it into its charger, and nothing's changed.
Is there a way to fix this or is it broken for good?

It is either the wire that connects from the phone to the screen is loose or you need a new screen. You should go to your local repair shop and they can get this fixed for about $40 for a new screen. If its loose hopefully he won't charge anything.

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