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mhm.71 Level 1 Level 1



I have MacBook Pro 17" late 2011. After Mountain Lion installation, internal speakers are not working. I can hear soud from speaker during system boot, not n ot in OS. Speaker symbol is grey, not black. Headphones are working fine.

Re-installation, NVRAM clearing, etc. haven't solve the problem. I have discussed with Apple support, but they cannot to help.

I have also tried with OSX Lion, with that one speakers are working perfectly. So it cannot be a hardware problem.


Any ideas?

MacBook Pro (17-inch Late 2011), OS X Mountain Lion (10.8.1)
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