Audio stops working right after login

Hi everyone, I have a macbook pro 13inch mid 2009 running mac osx 10.7 lion. Few weeks ago the audio stopped working but after few moments and 2 reboots it started to work fine again. Now are 2 days that the problem came back. I tried to reboot multiple times, to reset the nvram and pram, to use headphones (they dont work either) and to kill the process coreaudiod. Still nothing! I know that it is not a hardware problem since the sounds stops working just right after I login (the sound at the start works and on the login screen the audio controllers still emit the sound), the only sound that seems work after the login is the sound of the trash folder when I empty it (weird isnt it?). I know that a osx reinstallation would probably solve the problem but I dont have time for that right now and I dont want to risk to lose some file. Does any of you have any solution?

System Preferenes > Sound > Output > Internal Speakers
Make sure that Mute is not enabled.
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 times to flip the microswitch inside.
Sound output may be stuck in the digital mode.
Best.

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Audio stops working right after login

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