Iphone 4 AT&T Cannot sync to any computer or itunes

[edson3000]

I believe my iphone somehow has been "fried". I tried to charge my phone using a car charger and i noticed the wires had been cut. not know which went to which i tried to do my best to figure it out. i plugged it in and it didn't charge. (My job involved being on the phone 24 hours and i was waiting for a call from my boss so i was desperate) I got home and tried to charge it normally from another usb and it wasnt charging untill it was either off or below 5%. I figured maybe if i replace the charging port it'd fix the problem. It did sort of. Now it will charge the phone to 100% fine but it will still not be discovered by my computer or itunes or any other computer once i plug it in and when I make or get a call they hear me like if i was far away. I would like to fix it myself just to know more on how to fix itunes. any ideas? Everything with the iphone still works fine. please let me know if theres a solution. -Edson