Lost audio on my iMac with Mavericks download, any ideas?

I've lost all audio on my iMac with the download of Mavericks, does anyone have an idea?

I did get my audio working again, don't know for sure why exactly, but here's what I did. First of all I have my external speakers plugged into my headphone jack. I had zero sound of any type plugged in or not. First thing I did was to reinstall Mavericks - still no audio. I tried everything on the computer that said "Sound - Mute - Volume etc... computer geek I'm not. Under System Preference I went to Sound clicked everything, Under Output I clicked on headphones - It was already On, I clicked it Off then On again - all my sound came back. I'm not sure why since I had no audio sound with or without the speakers plugged into the this jack. Maybe it was a combination of things and I got lucky. Hope this helps!

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