Screen on the Iphone 4s?

I'm into repairing Iphone, Iphones, because when my Ipod broke I fixed it by myself.
This is an Iphone 4s from AT&T
It was dropped (looked like someone nuked it haha) the screen is cracked, the back is cracked even worst, and I opened it up and the hardware was completely perfect
It won't turn on when I plug it into the computer, maybe it's dead and I'm inpatient, and the screen remains black no matter if I try a hard reset or anything else.
I ordered a new screen, going to try and open it up and replacing it to see if that helps.

My questions is: If it's not the screen, and nothing is wrong with the mother board or any other part, what could be wrong with it? Perhaps the battery?

The iPhone will still function when plugged AC, even if the battery is toasted. I dropped my 4s snowbaording and it fried the battery, but on AC it would work.

You might want to make sure there's no metal touching the logic/main/mother board. It can short it enough to not power up…

Besides that, if all wiring is intact, like you mentioned, the logic board…

I cracked my iPhone 4 screen recently. I wasn't going to pay heaps to get it fixed, so I found iscreensfix.com and followed their DIY repair guides and videos. I was a bit skeptical before I bought it, but I was really glad I did because it was actually easier and quicker than I initially thought. I had my new screen on and my phone was up and running again. In your case, it sounds like the LCD has stopped working. You can email them if you like and they'll be able to help you out, plus they also have a guide on repairing the back cover of your phone. I would certainly recommend them to anyone who has a cracked screen waiting to be repaired.

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