The plug-end looks like the same mystery cable I had not too long ago that came with my Video card. Mine we an SPDIF cable, which has something to do with audio hardware. See THIS resource for more information. Hope that helps!
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So I broke down and busted the plastic end to see what it was hiding.
I still have no idea what this thing does. The cord just separates at the end into the two small metal rods, that were slid into opposite sides of a glass tube (that I busted, oops). The rods overlapped each other before I broke the glass. The tube was at the fat end of the plastic piece. What the hell is that?
I'm still interested if anyone knows, just so I know what to look for if I need to replace it.