Guess few people may face the problem of no sound in your speakers but everyting looks fine. Just check in the control panel under sound window. Check whether your speaker is set to default output device. For example if you have a usb modem and it have a earphone output facility, that might be set to default output device automatically on installation and sounds from your pc will be directed to this device eventhough it is not connected. Please refer the below screen shot for clarification.
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| sound settings from control panel |
