My Iphone 4 just stopped working. What can I do to fix it?

I fully charged my i-phone then I took it off of the charger & went to bed everything was fine, when I woke up the next morning my phone wouldn't turn on.

I tried everything! Holding the power button & the middle button at the same time for a while, nothing. Tried charging it again, nothing. Plugged it into i-tunes and its not showing up at all. The screen is just black. I even went to a phone shop and he tried switching the battery and nothing. What to do?

Logic board is probably fired.
sell it for parts.

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