My iPhone screen went black and I can't restore it
My iPhone screen went black about an hour ago but the phone was still on and I could use Siri. I tried turning it off and then back on which didn't make any difference. In a dark room I can dimly see the screen glow but it's still black and blank. I tried restoring my phone using iTunes but it won't let me because Find My iPhone is on. When I try to restore the phone it says I have to turn off Find My iPhone which I can't do because the screen is black. I tried asking Siri to do it but she doesn't seem to know what Find My iPhone is. Also now when I plug it into the computer it vibrates continuously. Any suggestions?
iPhone 5, iOS 7.0.6