Why would my iphone won't work its just on a black screen iPhone 5 help any one?

Why would my iphone won't work its just on a black screen iPhone 5 help any one?

You have what is called BSOD…" black screen of death "
This is from an apple forum… This " appeares " to have worked for several people…

Press and hold both the power and the home button for approx 20 seconds…