Iphone 4 stuck black screen (broken power button)?

My iphone 4 is stuck on black screen (it has broken power button)

last time, i put it in dfu mode with dfu ipsw made by redsnow

computer isn't playing any sound on connecting it

Take it to Apple. If you are still under your warranty, you might be able to get a new iphone 4. Cuz they said they can't repair just the power button. The whole unit needs to be replaced