Apple iPhone Smartphone "back buttton work" Questions

back to normal I use my iphone as my alarm. The alarm won't off but when I went to shut it off and touched the OK button it wouldn't do anything. It froze! The screen went black with the "Snooze &

...buttton until the apple logo dissapears...now ur phone should be off. Make sure ur iphone is not connected to usb so far...wait 2 minutes and open itunes on ur comp, and plug one end of the usb cable ...

...back in but that didn't work. The phone still works and can be turned on and off but the screen is black so i can't do anything with it. do a master reset press the menu button go down the left hit ...