So far I open up the Hard Drive Slot, The Ram Slot, Graphic Card, Take a look at the PCI slots and The Super Drive. So basically how far can I go without voiding my Warrantee? I havent get to see the CPU and check out the Power Watt yet. I notice on the fans I see screws holding it together. Should anything with screws I shouldn't touch? I may need to clean it and upgrade it someday. So was wondering how far I can go without voiding my Warrantee? Also see that the Mac Pro only have 300Watt power. Isn't this a little less? Some graphic card required 350 - 400+