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your software may be setup for only one device and will only find the latest one. However, when you plug in the 512 model windows should still notify you that something has been attached to the usb port. If the device plays ok the batteries are probably ok and if so it's probably the connector or the cable unless you're using the same cable with both units. If the unit doesn't play it might be the batteries but even then windows should notify you when you connect the device if it's making a connection because the battery charger should start drawing current through the usb cable and windows should sense this. Mine stopped working when my grandson removed the cable while updating the firmware. Had to send it in to get the firmware rebooted