I don't really notice the noise because I store the MB in my desk drawer, but I noticed quite recently that the area below the MB screen has a brownish discoloration now, I assume because of the intense heat. I've been using an external monitor connected to the MB with its lid closed for about a year... so far no problems... But I'm wondering, am I shortening the life span of the MB by doing this? I've heard horror stories of the MB's fan breaking and destroying the whole laptop. I'm pretty sure the overheating isn't too good either, but I want your guys' assurance. Thanks.