Suddenly my ACER 4745G can't play music.
I checked in control panel > hardware & sound > sound > speaker > test, error "Failed To Play Test Tone".
I reinstalled sound driver but it's not working.
After a few reading finally i saved (again) with windows 7 special command:
SFC /SCANNOW
Run "cmd" as administrator > type sfc /scannow > wait process to finish > done.
My laptop sound back to normal.
Thx Windows 7, you are so cool!
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