Integrated speakers not working on MacBook 13" 10.5.8

Speakers are not working on MacBook 13" 10.5.8, however the startup chime does work. Plug-in headphones also work. Have searched all over google for answers but nothing fixes it. How do I check the drivers are correct?
Thanks!!

Hi, Revoluzion.  
Thank you for visiting Apple Support Communities.
Here are a couple troubleshooting articles that I would recommend going through when experiencing this issue.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/en-us/HT201295
Resetting PRAM
http://support.apple.com/kb/PH6478
If the issue persists, I would recommend going through the steps in the article below.  After all steps have been processed see step 5. 
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/en-us/HT203186
Cheers,
Jason H. 

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