What is wrong with this iphone? And can it be fixed, and if so.how?

Ugh, i'm having trouble? My cuz came to me recently with an iphone whose os seems to be erased, i don't know, i'm just saying, anyhow, when the device is turned on, a blank black screen appears, with what seems to be the apple logo on it, however it does nothing else, so. Can anyone tell me what when wrong?

I think that for myself, I found the cheapest company to work with. They work on all kinds
of things, and have fixed my IPad, but they work on your phone as well.
Give them a call.

http://www.repairzoom.com/iphone-4-repair.html

Toll free number--
1-877-274-5964