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Computer speakers work, but good headphones don't produce sound
I'm using Windows 7. The computer speakers work, but when I insert known good headphones into the audio jack, the computer speakers mute (as they should), but no sound comes through the headphones. I checked all the sound indicators (e.g. control panel/sound, the sound icon on the tray and device manager) and everything indicates the volume is up and the device is working. I've encountered this problem perhaps a half a dozen times and a reboot always fixes the problem. My only guess is that some application or virus is running in the background which is interfering with the ability of the headphone jack to transmit sound. Does anyone know how I can fix this problem without rebooting the computer? And does anyone know what the culprit might be which is interfering with the sound being transmitted into the headphones? Thanks!