If the device is plugged in and still is not turning on, it may not actually be charging the battery. First try plugging the device into a different outlet in your home to ensure it is either the device or the charger. If it still not charging, you may have to purchase a new charger. If the device is still not powering on the charging port on the device could be damaged. This will need to be replaced. If nothing else has fixed the issue, the battery is your last option. Replace the battery and the device should work correctly.
This device has a traditional style hard drive. This means it has a physical disc that data is stored onto. If the device is dropped or shaken, the disc could be scratched causing any data in this location to be damaged and rendered useless. If your favorite song is stored at this location, it will not play correctly, if at all.