Up grade now no sound on my mac book pro

I recently upgraded to mountain lion on my mac book pro 2009 and now I have no sound. Not sure how to fix it. The sound symbol is greyed out. When I select the increase sound button it has a international no symbol. My note book specks are listed below. I'm not sure if my computer meets the requirements of Montain Lion.
Hardware Overview:
Model Name:          MacBook Pro
Model Identifier:          MacBookPro5,3
Processor Name:          Intel Core 2 Duo
Processor Speed:          3.06 GHz
Number of Processors:          1
Total Number of Cores:          2
L2 Cache:          6 MB
Memory:          4 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          MBP53.00AC.B03
SMC Version (system):          1.48f2
Serial Number (system):          W894900FAY8
Hardware UUID:          3523E80F-4FCA-5937-A329-9E230535C1F5
Sudden Motion Sensor:
State:          Enabled

I tried one last thing before I did this. I simply shut down my laptop and then restarted and the sound now works. My laptop was only rebooted after the install. The reboot was the second cold start since I installed Mountain Lion. I usually only put it in the sleep mode. I will continue to explore mountain lion and try these fixes if I have any more problems with the sound. Thanks a lot for the help.

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Have you tried a pair of ear phones yet? If not, try it.
If no luck, gently pull them out and push them in a few times.
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SMC Reset: http://support.apple.com/kb/HT3964
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I've tried everything that I know about.
And what it is, that you tried?
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Up grade now no sound on my mac book pro

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