hissing from a hub

I've got this 3Com OfficeConnect Dual Speed Hub 8 that is putting out this obnoxious hissing noise. It's loud enough to be annoying and add significantly to the white noise in my office. It sounds like the air is slowly being let out of a tire...forever. I've opened it up and found a capacitor with some brownish crusty stuff caked on the top of it. It also was bulged ever so slight at the top, as was another one right by it. Both are within proximity of the power connector. I didn't see any blackened spots on the enclosure indiciating that either had let out any magic smoke. So the question is, what is the most likely cause for this hissing? I've had a device before where the capacitor was causing the hiss (or at least I was pretty sure). There doesn't seem to be anything else in there that would cause the hissing (a bunch of ICs, a couple couls, a couple power transistors, etc.) Any help appreciated. -- Sellam Ismail Vintage Computer

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