My kcs 35's have started to buzz... I used it mainly for computer work, so really didin't play it that loud, but it's got a buzz now in one ear... Is it blown? and.. what now? If I ship it back.. I get a ksc 50? Any way to fix it?

I was browsing the Koss site, and came across their computer headset, SW-50. Has anyone tried these? They seem to be the same drivers as the KSC-35, with the addition of a boom mic.. I'm just looking for a good computer headset/mic... But I can't find them anywhere in Canada.. I guess I...