You have one of these issues for your Notebook Model : Acer Aspire 7730ZG ?
No Sound / Audio detected on your system
.
No Microphone detected
Sound have distorsions
Dont have sound in HD Movies
No sound on youtube videos
No sound on internet websites
No sound in Windows 7 / Windows 8
Sound acceleration not available
Tips for fixing sound common problems
Sound is really distorted
Only music on background but no voices
Hear only actors voice in film / movie / clips
No bass at all after re-installing windows
After windows re-install i have no sound
No sound on speakers at all
How to resolve sound issue for my notebook Acer Aspire 7730ZG
My laptop Acer Aspire 7730ZG have serious problems with sound / audio
How to fix sound issue for Acer Aspire 7730ZG
And here is how to solve these problems quite easy :
First you need to uninstall old driver (look for realtek sound or use free uninstaller from Download Tab)
Second you need to clean driver traces after uninstall (use this tool)
Third step is to install new driver from here or here
Now just restart your machine and now sound will work proper.
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How to solve sound issues for notebook Acer Aspire 7730ZG