What happened to the sound in MacBook Pro??

System Preferences: Sound: Output: Internal Speakers
No sound through internal speakers.
No sound if I plug in earphones.
I hear the start-up chime, but nothing else.
The volume up/down keys act as if they work fine.
Any ideas?
POSSIBLY related??
When I try to startup iTunes (9.0.3), I get the error message:
"The iTunes application could not be opened. An unknown error occurred (-200)."
I tried (twice) to reinstall iTunes, but I get the following error:
"The installation failed. The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance."

I did most everything you suggested (well, attempted to, anyway), and more. I used Apple's Hardware test, which indicated that my hardware was hunky-dory. But when I got to the part about archiving and installing, the installation failed. Twice.
Oh, jolliness!!
I finally called Tech Support (LOVE those guys!), who loved that I had documented all the troubleshooting I had done, along with the error messages. Noah told me that I should have called after I could not re-install iTunes.
Noah was VERY VERY happy that I had done a recent backup (3 days earlier), since most of his callers do NOT. Tsk, Tsk!
Did you know you can do a full restore from Time Machine? I thought you also had to have the system disks, but I didn't. (Turns out the OS disk was faulty).
Anyway, after the TM restore, the clouds parted, and smiles returned to my face.
Thanks for getting me in the right direction!

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MacBook Pro
MacBookPro7,1
Intel Core 2 Duo
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Nombre total de cœurs :          2
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Mémoire :          4 Go
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Version de la ROM de démarrage :          MBP71.0039.B0B
Version SMC (système) :          1.62f6
Numéro de série (système) :          W804853GATP
UUID du matériel :          716CB476-983B-5C43-B363-988FB608C01C
Capteur de mouvement brusque
État :          Activé
System:
Mac OS X 10.6.7 (10J869)
Darwin 10.7.0
Video DIsplay Card
NVIDIA GeForce 320M :
Jeu de composants :          NVIDIA GeForce 320M
Type :          Processeur graphique (GPU)
Bus :          PCI
VRAM (totale) :          256 Mo
Fournisseur :          NVIDIA (0x10de)
Identifiant du périphérique :          0x08a0
Identifiant de révision :          0x00a2
Révision de la ROM :          3533
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Profondeur de pixels :          Couleurs 32 bits (ARGB8888)
Miroir :          Activé
État du miroir :          Miroir matériel
Connecté :          Oui
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