Red light coming from the headphone port

does anybody know why there is a red light coming from the headphone port.
This is after i reformatted 
Thanks
Moderator note; subject edited for relevancy

This is perfectly normal. You can run an optical digital out this way. You need a mini-toslink adapter like this:
http://en.wikipedia.org/wiki/Mini-TOSLINK
Then you can set the digital out as default (instead of Speakers) to run audio to a surround sound reciever via optical fiber.

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