Hello there, I have a macbook pro Peryn 2.4ghz (silver keys) and with the faulty GPU, but never had trouble with it. When I start using skype or watch a clip on the internet, my fans start kicking in and they are full speed. Is this normal? Is it because there is dust accumulated? Is there a way I could clean this removing the top case??? Is it normal for my macbook pro to act like this? Thanks for your help.