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Next to my headphone and microphone 3.5mm jacks there is one more 3.5mm port with a little image that looks like the image below.

What is this port? What can it be used for?

enter image description here

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That is a mini-TOSLINK port. You'll need a cable like the one below to hook it up.

You can use it for hooking your laptop up to a home theater or other stereo with a plug for optical connections.

mini-TOSLINK

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mini-toslink - @Melikoth: I added an image to your answer - please delete it if you prefer. – RedGrittyBrick Nov 18 '11 at 18:55
Thanks. Can I use this port to output to CRT type TV (the old type of TV's) ? – Jacques Nov 18 '11 at 19:03
@Jacques, no... This is digital. Your old CRT TV is analog. – David Nov 18 '11 at 19:08
Is there a way to output Video + Audio to a CRT TV and what would be the easiest way? My laptop is modern and has all the modern ports but my TV not so modern.. Thanks. – Jacques Nov 18 '11 at 19:10
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@Jacques: Not directly with modern laptops. Some old ones had an Composite or S-video connectors, but most new ones come with an HDMI interface which can pass both video and audio signals. The highest quality solution would be to find a newer model TV on the cheap that has the plugs you need, making your current one work with the laptop will likely be a mess of parts. – Melikoth Nov 18 '11 at 20:48
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