Equium A100-306: built-in speakers do not play some sounds

I have had my A100-306 for 2 weeks, and my built-in speakers do not play some sounds. This problem has only arisen over the last few days. When I go through the control panel to speaker settings it says there is no speakers.
Can any one advise me as to what to do to fix this problem?

Very strange
I think you should check several possibilities:
- connect the headphones and check if you can hear the sound through the headphones.
- Please check the device manger. Do you see any yellow exclamation marks???
Try to remove the sound card and remove the sound driver.
After new reboot try to reinstall the sound driver again.
- On the notebook the Realtek HD sound effect manager should be installed.
Please check there the settings.

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Equium A100-306: built-in speakers do not play some sounds

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