How do I get the sound back from my computer?

I have a MacBook Pro late 2008 and running Lion.  I have lost sound in my computer.  I can jiggle the laptop and get it to work but then it quits. 
Any ideas what a new sound system costs?  Is there an alternative option? 
Thanks.

Resetting NVRAM or
Finder Go menu -> Go to.. ~/Library/Preferences, then delete
com.apple.recentitems.plist
com.apple.systempreferences.plist
ByHost/com.apple.soundpref.xxx.plist
com.apple.systemsound.plist
and reboot could solve your problem.

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