I've been connecting my Incredible to my iMac via usb and syncing music flawlessly. Until today. I hooked it up with the same way I always do and the phone will not give me the option to select "mount as disk drive." Therefore, the computer will not mount the SD card or anything. However, the phone is charging. Is there a way to manually put it into usb mode? There is no usb notification at the top of the phone screen either.