Keep the home and power button pressed for 10 seconds, then, leave power and keep the home button pressed...shud be able to see the charging cable logo...then restore it...
It sounds if your motherboard is bad. If you want you can sell it here We give pretty good prices for broken iPhones http://iphonereplacementparts.com/sell-us-your-iphone.html
If your phone does not even turn on when you plug in your charger, open up your iPhone and make sure connector #4 is plugged in. If your phone turns on with a charger but turns off after you disconnect the charger, replace your battery. You can find batteries for the iPhone 3g by clicking here -> iPhone 3G Battery Replacement
my friend went on facebook on my iphone and my iphone shut off. now when i turn it one it it just...
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my friend went on facebook on my iphone and my iphone shut off. now when i turn it one it it just shows the apple then turns off again. tried recharging but it still does the same thing.