I have an LG Optimus V, and I have had this phone since mid-April. For a while, I had been using the stock usb to mini usb cable on my Mac for at least 3 months. Recently I purchased a third party charger, that has been working fine, but I just noticed the other day that the little "USB Connected" notification that used to show up whenever I would plug it in is now gone. How can I solve this? I'd like to have the ability to access my files again.