My GSM iPhone 4 will not charge. I installed a new battery and all functions work normally except the battery will not charge and drains to zero. I'm using a cable that works properly with my iPad 2. I replaced the dock connector and installed a new battery but this did not fix the problem. Before the new battery fully drained I did a full reset, but this also did not fix the problem. There was not enough battery life to try a software update. I also tried reseting by depressing the home and power buttons until reset. Any suggestions on what else to try? Thanks!