>From: "Pete Turnbull" <pete(a)dunnington.u-net.com> > >On Nov 24, 9:08, Dwight K. Elvey wrote: >> Hi >> Pairs of switching power supplies often interreact to >> make a sound like hissing. There may not be anything >> wrong with it. Still the electrolytic leaking might >> be a problem. > >OfficeConnect hubs, switches, whatnots, are very small devices that >have an external wall-wart PSU and no fan, and are normally

Ok, how about one of those little beeper/speakers? Does it have one of those? Otherwise, it is most likely an electrolytic.