I have a sandisk c240 that will not charge when hooked up to my computer. When I attach the C240 to the USB port (one in the back) two things happen. One, the battery charging icon comes on and indicates that the battery is charging. Secondly, the display shows that the device is “connecting” and “writing”. The device cycles through this connecting and writing and finally indicates that it is writing. As soon as this message comes up, the battery icon indicates that the battery is fully charged. When I disconnect the device, the battery icon indicates that the battery has not charged. I have replaced the battery.