Audio Out No Longer Outputting Audio!

A few days ago, I tried to plug headphones into my macbook pro, and while the sound stopped playing through the in-buit speakers, nothing came from the headphones. A simple restart seemed to solve it.
However, today I have had the same issue, but restarting hasn't been a positive solution. It happens with both external speakers and headphones which I have tested and are working just fine with my iPhone. I just did a software update to Mac OS X 10.6.8; I have checked under sound in system preferences (the sound output automatically switches between internal speakers and headphones when a jack is put into the headphone socket) and there is no red light coming from the socket as described by some others.
I'm now at a complete loss of what to try without trekking all the way to the nearest Apple store.

Might be corrupted sound preferences ...
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following;
/Library/Preferences/Audio
Click Go the move both .plist files from the Audio folder to the Trash.
Restart your Mac. See if that made a difference.

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