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Sound problem. Pls help

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I cudnt hear any sound on my computer suddenly. Then I just unplugged one wire connected at the back of cpu to one port and put it in front port . It started working. But even now, it stops by its own. I keep unplugging it but no use. Then I just turned off my computer and started it again, it starts working now. What is the problem and how do I solve it permanently? Is it some software prbl or what?