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I listen to a lot of music on my eMac G4. Lately it seems like the sound quality isn't what it used to be; I keep hearing a faint distortion or vibration, expecially on classical piano music. I use external speakers and I've tried changing them (currently I'm using Logitech Z-2300 2.1 speakers) but I can still hear the vibration on some songs. Could the internal sound hardware itself be deteriorating? I love my music! Is there an easy fix here?