Okay, so I was walking upstairs with my cracked iPhone 5.
Now the worst thing happens and I happen to knee my phone out
of my hand and it hit the last step and slipped in between the cracks and fell to the bottom floor (from the 2nd floor). So I grabbed it and it was flashing white and then shut off.

So I replaced the LCD yesterday and it looks pretty much brand new but it still didn't turn on.

I took another iPhone 5, swapped screens and both LCDs work on the working iPhone. Also swapped batteries and both batteries work.

Do you guys know of anything else it could be? Here are pictures of the internal of the broken iPhone 5. Everything looks straight to me, nothing un-ordinary.