My iPhone. 4 screen has gone blank?

Okay so my iPhone for screen has gone blank. I haven't dropped or broken the screen or anything it just ended up like that. I know the iPhone itself is not broken because when I change the volume button it still vibrates and I can hear the sound it makes when it's charging. I read online an people told me to reset the phone but I can't because my home button is also broken so I can't hold it To make it reset and also, when I tried doing it on iTunes, it told me that it was unable to reset because 'find my iPhone is activated' I can't deactivate it though because I can't see… So what can I do?

If it is unresponsive to anything the digitalised screen may have been scratched or have been wet so i suggest leaving it ne'er something hot and retry in an hour if not plug it in and you should be able to restore it even if it has any location service on but if not delete all applications from computer and anything on it. If it is jaipbroken launch reds now and hard restore!