No audio after Mountain Lion 10.8.3 update Macbook Pro Mid 2009

A few days ago I downloaded some updates for Mountain Lion on my Macbook Pro Mid 2009. After that there is no sound and internal speakers are not listed as an output device. The startup sound is still working (I would guess it uses the same speakers?) but nothing else makes a sound through the speakers. Also headphones are working. I'm not 100% sure if my OS version vas 10.8.2 before the update or not.
I have tried to input the headphones in and out many times to make sure that no microswitches are stuck. Also I have reset SMC and NVRAM/PRAM and reinstalled Mountain Lion. I even installed Lion (10.7.0) to be sure but it still won't work.
Any help would be appreciated.

Make a "Genius" appointment at an Apple Store.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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    com.apple.driver.SMCMotionSensor            3.0.4d1
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    com.apple.driver.AppleIRController            327.5
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    com.apple.driver.AppleFWOHCI            5.5.2
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    com.apple.driver.AppleACPIEC            3.1
    com.apple.driver.AppleAPIC            1.7
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    com.apple.security.quarantine            3
    com.apple.security.TMSafetyNet            8
    com.apple.driver.AppleIntelCPUPowerManagement            218.0.0
    com.apple.security.SecureRemotePassword            1.0
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    com.apple.kext.triggers            1.0
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    com.apple.driver.AppleSMBusController            1.0.13d1
    com.apple.iokit.IOUSBUserClient            705.4.0
    com.apple.iokit.IOBluetoothHostControllerUSBTransport            4.3.0f10
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    com.apple.driver.AppleSMC            3.1.9
    com.apple.driver.AppleUSBMultitouch            245.2
    com.apple.iokit.IOUSBHIDDriver            705.4.0
    com.apple.iokit.IOSCSIBlockCommandsDevice            3.7.0
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    com.apple.iokit.IOSCSIArchitectureModelFamily            3.7.0
    com.apple.driver.AppleUSBMergeNub            705.4.0
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    com.apple.driver.AppleEFIRuntime            2.0
    com.apple.iokit.IOAHCIFamily            2.7.0
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    com.apple.driver.NVSMU            2.2.9
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