My Iphone 4 has a blank screen

So, i was listening to Spotify on my Verizon Iphone 4 and then i pressed pause and then the home button and then all of a sudden my screen went white. I can still see the time, battery and i can also still see that i have 3G and full bars. It won't let me lock it or turn it off either! But, it will still allow me to 'screen shot.' Does anyone know what i can do to fix it? I don't have warranty and when i plug it into my computer, my account won't show up on Itunes (it has always done that)

Added (1). OMG.

Dfu mode? Hold power and home button until it shuts off maybe that will help

Try holding the Power and the Home buttons at the same time(for 3-4 seconds) until your screen flashes and your iPhone should reset itself(not like resetting contacts or notes it just shut everything off and turns it back on)

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