Solve : computer looping sound automatic restart computer?

1.	Solve : computer looping sound automatic restart computer?
Answer» Help me my acer computer keep CRASHING on me give me some stupid sound then looping again with continuing long sound then computer freezes then force reboot it self... i dont know why i had this machine for a yr now it started to ACT up i SENT my computer to be repair at acer they repair it PROBLEM is the thing still there Can ANYONE help meWhat sound is it making? What was it sent in to repair previously?

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