Iphone screen hardware or software?

I found this iphone 4s at a garage sale for a cheap price i picked it up the screen does not turn on but when you hold down the home button you can hear siri and the vibrations work i plugged it into itunes and could see everything and i ended up taking a screen shot and the screen is sideways (kinda like an ipad) i'm wondering if this is software or hardware will a full restore fix it or do i have to replace the screen?

It seems like its just a screen problem especially since it vibrates and makes noise but I would restore it just to make sure that it is not software. If you restore it and the screen does not work take it in and get the screen replaced.

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