This guide is the only one that has worked 100% for me with a
MacBookPro5,5 so far:

http://allurgroceries.com/mbp55/#sound

(this is the sound section, follow instructions to the letter and it
will work)

Before you try this though, open a terminal (Applications -> Accessories -> 
Terminal and type in:
sudo echo "options snd-hda-intel model=mbp3" >> /etc/modprobe.d/alsa-base.conf
 then reboot the machine. If this doesn't work then follow the above guide.

-- 
No sound avaible on MacBookPro 
https://bugs.launchpad.net/bugs/483332
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