Q: my screen has gone black from my ipod touch but its still on and sounds?

My ipod was recently fixed because the screen was cracked then like two days later i drop my ipod but the fall wasnt even that bad when i check to see if my ipod is ok i notice that my screen is all blac but my music was still playing i tried iMessaging myself throuch my sisters ipod and it sounded i also tried facetimeing myself and my screen was all black but My sisters ipod saw me perfectly i also noticed my ipod was making very weird noises during the face time. i tried charging it but nothing happend. My sleep button doesnt wor either. Please help me!!!!!