MacBook speakers and headphones are not working! Please help.

MacBook OS X 10.6.8
2009 model
I was watching a movie and my MacBook randomly shutdown by itself. I turned it back on and had no more problems, so I restarted the movie. The audio was not working in my headphones. So I tried the internal speakers and there was still no sound. I did a quick google search which led me to trying various options and finally called Apple Support on the phone.
I've tried resetting my PRAM but it only showed an alternating screen between grey and black. Nothing happened. I also reset SMC but that didn't work either. I have checked everything in system preferences, Audio MIDI, etc. and it all appears to be correct.
While on the phone we found that when I plug headphones or an external speaker in, it does not show up on the "output" menu under System Preferences > Sound.
I do NOT have the money to go to a computer store and the nearest Apple Store is 2 hours away. I desperately need help because most of the work I do involves having to be able to listen to sound. Please help if you can. I'm not ignorant when it comes to computers but I'm no genius. If you have any ideas, please be specific. Your help is very appreciated.
PS. When a speaker is plugged in at first, I hear a little crackling from it. The same happens to what sounds like internal speakers if I start a video.

Hi,
Please use the following instructions to check and fix:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01912228&cc=ad&dlc=en&lc=en&jumpid=reg_r1002_us...
Good luck.
BH
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Please use the following instructions to check and fix:
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MacBook speakers and headphones are not working! Please help.

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