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i'm just looking an old mother board waiting for my favorite TVShow and and i wonder what's this component? Every motherboard i've seen have this kind of solenoid (I am sure that you already settled this question). But what is this? What is his function? If an hardware specialist can try to answer my question.. I will be an happy man..

I join a Picture.. Strange and mystic kind of solenoid.

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Interesting. When I usually think of a solenoid, I think of something that converts electrical energy into mechanical, like the solenoid that starts your car. According to Wikipedia, it's actually a metallic coil or inductor. – J. Polfer Aug 26 '09 at 19:54
+1. I've always wondered what the actual name for those was. – RJFalconer Aug 26 '09 at 20:36
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A solenoid is a coil of wire that convert electrical energy into magnetic, usually, but not always, to move a metal shaft back and forth. There is a fairly large solenoid on your car's starter. It moves the starter gear forward to engage the fly wheel when you start your car, and pulls it back when you let go of the key. If you try to start your car while it is running, the grinding noise you hear is the turning gears being force into contact (not good for your car). In this question the componet is a noise filter, so I would call it a toroid, not a solenoid. – Jim C Aug 26 '09 at 21:10
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Its a toroid inductor used for noise suppression. it passed DC current and rejects AC noise.

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