Http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?&LegacyDocID=MIGR-4VGUYW
here is the support center for lenovo ..and I already selected your model ..
select the operation system you use..and download the audio driver and reinstall it clean ..(this means you have to remove from control panel . remove programs ..all drivers related with the audio card ..and you might have already tried without success ..)
After installing restart the system ..and if there is nothing wrong physically with the sound card .. it will work just fine
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