A couple days after buying my 4520GZ, I noticed that the ventilation fan seemed a little too loud. It's not that it's quite loud, as it doesn't sound like it's running smoothly. To me it sounds like a cricket, at least the 'beat' of the sound of the fan, I don't know how else to describe the sound. This has been really irritating me the past couple days, and I am wondering if this is the normal sound. At first the sound only started when the fan started going more during games like quake 3 and whatnot, but now it randomly starts when I start Windows XP, or Linux. Can someone please tell me if this is normal. I already had to exchange my first one I got, because I had it in a laptop case, and that kinda...fell.. off my kitchen table, and it didn't run too good after that. Because of that I don't want to exchange this one to best buy, because I doubt they would be able to hear the sound because of the noise in the store, and would think I'm crazy. 
