The HDD on my 1.5 Ghz Lapzilla seems to be making clicking noises. The noises are from the area to the left of the trackpad - it doesn't look like a fan is located there. With my past experience on drives that start clicking have an impending drive failure I am pretty concerned. The system does have AppleCare. Does anyone know if this is a part replaced at an apple store or does it get shipped off? Do I need to wait for it to die before exchanging the HDD? Am I just confused and it is actually a fan in that location?