Playback devices are lost on disable

I installed a GeForce 210 in my HPa1710n computer with a Win 7 Home upgrade, hoping to connect my TV as a second monitor with the HDMI connector. It worked fine until I tried to use my speakers with the TV turned off. My onboard sound was not recognized as a device. I rebooted and enabled onboard sound through the BIOS and it recognized it again, but when I tried to disable onboard sound to listen to the TV, it disappeared again. Any suggestions on what I'm doing wrong?
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More about playback devices lost disable
  1. Have you checked your Device Manager for a badly installed device?
    I'm a little out of my depth here, but it may be possible the two devices are trying to use the same computer resources like memory addresses.
  2. In device manager, no trouble signs. Video shows the GeForce 210, but under sound it only shows NVIDIA HiDef audio. No sign of the Realtek onboard sound that I think came with the board.
  3. Best answer
    Disconnect all external sound oriented devices, then delete the Sound device in the Device Manager and reboot.
    This would cause Windows to reinstall the device.
    What sound device does Windows reinstall without your external device connected?
  4. It had a generic audio device (S/PDIF?). I updated drivers and it installed new drivers and it now has speaker, headphones and Realtek Digital output.
  5. Best answer selected by ltlon.
  6. Thanks, that did it.
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