Original post by: Garry ,
First I would check to make sure the dock assembly is connected properly and is sitting right on the logic board. Also check if it is getting an antenna signal and home button working. If those check out you may want to look for pins missing in the dock or other debris causing an obstruction. The cord you are using could be defective (if using the same cord). I don't think it would be the battery in this case because iTunes isn't recognizing either.