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hp 6720s sound problem

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hey everybody here
i have a little problem with my 6720s! after a dard disc problem i changed it to an 500 gb hard disc and installed with the method of blackch (http://blackchblog.weebly.com/) so everything is working, only the audio card makes problems.
i have had installed snow leopardt 10.6.5 before on the laptop without problems and the audio had worked, but now after the new instalation it only works over the jack plug but the internal speaker dont work!
ive tried other kexts also the kexts from an backup of the old system. after changing of the kexts ive startet kext utiliti to repair permissions but no chance to get it work!

i hope you have an idea how i get it to work!

greets info-lcc

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