Hello friends I am using HP Compaq dx7400 Microtower PC. And first I was using windows XP in that but after that I have upgrade my operating system to windows 7, but since I installed the windows 7 in my Computer after that I am not able to use the speaker. When I put cursor on sound icon in system tray then it says that no speaker and no headphone is plugged in. I don’t know what is wrong with my computer but I want to solve this problem. I need a help to solve this problem.
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