Quieting Your G5?

metajunkie wants to take a bite out of this issue: "I recently set up an at-home recording studio with a DP G5 and a ProTools mBox. Problem is, I can't record (like, say, a voice over) anywhere near the computer because when the cooling fans kick in, it comes in way too loud over the mic. I can't move the computer into another room, and while I'm tempted to throw a blanket over the thing, I don't think that'll help. Does anyone know a place that sells a silencer box for the G5 or some good DIY way to cut out the noise?"