My Acer Aspire 4741G laptop sounds suddenly stopped working

Help!!! yesterday it still working but today,no sounds come out from the speaker,I used headset to test it and it's work,but when I unplug my headset it still no sound,I already try to reboot using safe mode but getting confused.. what can I do???
f.y.I : I already check the sound driver,no question marks appeared.
 
"I already checked the sound driver, no question marks appeared"... Do you mean no exclamation points like this (!)? If you can hear normal sound from the headset the sound driver is okay. This could be caused by a keyboard setting. Make sure the sound is all the way up and that it is not muted
 
Does your laptop have HDMI output? Did you go and change any of the default settings for HD Sound. What you can do it this. Uninstall the Audio Drivers from the device manager Make sure you download the Audio drivers for your laptop from ACER prior. Simple fix is uninstall the drivers and delete them. Then reboot and Windows will try to install the drivers. But you don't let it you install the Audio Drivers.
 
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