I have an LG Optimus One P500h that is just over a month old. I noticed in the last couple of weeks that whenever I connect it to my PC via USB, it only charges. It worked fine until one day. I have tried enabling USB Debugging and Mass Storage modes in the settings, and combinations of other settings. I tried different USB ports on the computer. I also tried reinstalling the USB drivers on the computer. When all else failed, I did a factory reset of the phone and formatted the Micro SD card. Nothing seems to work. The only thing I can think of that I did differently was plug the phone into a rental car which had a USB port. I was trying to charge it and it kept going into mass storage mode. I don't think the phone has displayed the USB Connected dialogue with my PC since around that time. Any ideas?