computer doesn't recognise mp4 player
When I plug my mp4 (xx.y model number a496 bt) into the USB port my mp4 charges, however my laptop doesn't recognise that I've plugged something in. Before, when it worked, I would plug it in and it would have two options, charge and play and charge and transfer. This option doesn't come up any more, instead it just charges. My usb ports are working, and I've tried plugging it into all of them but it doesn't make a difference. I've tried plugging the mp4 into another laptop and the same problem happened. It's also quite new. I really don't know how to fix this, I've tired factory reset and formatting the device, so all my songs have been deleted off it, but I have no way of putting them back on again. Please help!