I have an iPhone 4 that won't load up, what can I do about it?

I

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iPhone 4 that won't load up

My sister recently dropped her iPhone 4 and smashed it across the screen. Since then, the phone will not turn on or load up when plugged into a wall charger however it will load up the Apple logo for roughly 3 seconds before showing a black screen again when it is attached to the computer. It has not gotten past doing this for the last 3 days. It's still connected to my computer now but it's not showing up at all as being connected.

Any idea what I can do about it?