There is no sound from my dm4 notebook

there is no sound from my dm4 notebook.
I bought it from a bestbuy store around October as of last year (2011), and it was doing fine with the exception that sometimes it mute on its own when I start up the laptop and sometimes the mute/unmute button on the keyboard is not working.
Those problem I could deal with but now now there is no sound/ audio coming out of my laptop.. I did some checking on 'speakers and headphones properties' and a couple others based on the internet forums, it seems everything are working fine and enabled but still there is no sound coming out of my laptop, could it be physical damage inside??
update 1: last time I heard a sound was when I was using an earphone, the next day i unplugged the earphone and cant hear no sound, I later tried to ue the earphone again multiple times but to no avail.
update 2: i tried to update the IDT high definition Audio Codec from the device manager but it said I am already using the most updated one. 

Got a restore point just prior to the problems?
Time to use it.
It still doesn't deal with the issue of the sound dissapearing.
BUT, see if the restore point works first.
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