My iPod has done the exact same thing, it jut all of a sudden stops working. But to fix it you hold the power button and the home button at the same time until it asks you to turn it off and then turn it back on. Problem solved!
The 2000 Hyundai Excel indicator light and brake light might stop working all of a sudden because of a burned out bulb. Check all bulbs on the brake lights and turn signals. This problem could also be caused by a blown fuse or a blown flasher fuse.