My iPhone 4 screen won't turn on

I dropped my iPhone 4 on the wood floor right now, and the screen didn't shatter. However, the screen will not come on, no matter how many times I push the buttons, or hold the home and top button down. But what's weird is that it still vibrates when I plug the charger in. However, it won't vibrate when I call it. There's only one crack but that's from a while back(the same day the Cowboys played the redskins for the last time to be specific). I've had this phone for a little over a year now.

Sounds like the power supply for the LCD got bumped loose, or is damaged. If you shine a flashlight at the screen can you faintly see anything on your phone? I would recommend taking it to a local repair shop unless you are okay with opening the case yourself. I do these type of repair myself but not everyone is comfortable doing this pr have the technical skill to do it. Worst case scenario would mean you have to replace the LCD. Since it an iphone you will not have too hard a time finding someone who can service it for you, or if you are okay with tinkering, there are plenty of e-manuals for replacing the iphone screen. You would basically follow those instruction and could also check to see if the cable in just lose at the same time.