iPhone 3G can not start
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My problem is simple. 2 weeks ago I changed back cover on my Iphone 3G and when I reassembled it back my Iphone did not turn on . I plugged it in and I heard some whistle and when I tried to turn it on again , only apple logo appeared for 10 seconds and it turned off again. I am sure it is logic board problem because I put it in my friend's Iphone and had same effect.