All the sudden the other day my computer started to sound almost like a fish tank filter. Not as bad, but the sound was definately something new to computer and me. I was wondering is my fan going out? It sounds as though it is the fan that this new noise is coming from. Could really never here the computer before this, now the sound is constant and goes on all the time. I leave my system on 24/7. My only guess was the fan might be going out.