I got a 3G 8gb here and i tryed everything!

The iPhone wont sync, charge or connect to any computers/macs with lots of differents USB cables..

I tryed:
Changing battery, changing dock usb flex cable inside the phone...
Also tryed to put the phone in DFU mode, but the computer wont find it^^
No charge at all... Still if i try to charge it from wall, or anything..
(The speaker and the mic on the flex cable is working ^^)

In worst case im gonna have to send it to somebody that can fix this, give me some offers^^ I am not able to pay to mutch..