'Optical out' audio drop out on Mac Book Pro

This is driving me INSANE!
First of all I'll give you my mac book pro details:
Mid/late 2010 MBP 2.66 i7 with 8GB RAM, on snow leopard 10.6.8
Here's the problem. Basically, my audio keeps dropping out. Upon a bit of research I can see the output device is switching from 'internal speakers - built in' to 'digital out - optical digital-out port'. I didn't even know my mac book pro had an optical digital output, as it doesn't appear there is one. However there's a red light that goes off and on, or sometimes flashes, more or less in unison with the drop outs and the switching of the output device. This also shows as when I try to adjust the volume, it doesn't let me and shows the sign with a line through it, as if I was using an external soundcard. It is incredibly frustrating as I can't do simple things such as watch a youtube video or play music on itunes.
Sometimes if I go from not using my mac, e.g. over night, then open it up and play itunes it will be fine. However when I open safari and start browsing or playing things via youtube the problem does seem to get worst. It also seems to cause my mac to freeze up a bit, I'm guessing as it's trying to switch devices.
I don't really know what to do, searching online hasn't really yielded anything useful.
Thanks, Christian.

Nobody ?

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