Step 3Clearing the area of "crud" erm contaminants
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Now, I don't know about you folks, I don't use the actual keyboard on my ibook much, I have an external one for that, but even still there is a lot of crap like dust, hair crumbs that get not only between the keys but right underneath it. Take the time to clear it out with your finger(s) (depending how many you have :-P ) or vacuum it out. You defiantly do not want stuff like that interfering with heat transfer. As you see below, there is a space between the plastic case and the airport "extreme" (I never believed in the whole "extreme" business). This is where on the inside, the cpu's heat sink lies. Now if you've ever had one of these apart to replace the hard drive, you'll know that there's more metal in a knife and a fork put together than in the heatsink, I'm rather disappointed with apple. Even my Toshiba satellite 2520cds (old old computer) has a bigger heat sink for it's ENORMOUS k6. Adding a heat sink on the outside will help somewhat to at least dissipate heat from the case as if you feel that area when it's on, especially if it's been on all day and night, it will actually heat up enough to burn you or enough that you can't hold on. On top of the airport card, it also gets relatively hot due to the ram chip(s) directly below it. You don't have to do that step, but I did just for shits and giggles and because those cards are EXPENSIVE.