I just got my macbook back from the Apple Store (The Power Board and the Top casing (keyboard, mouse) had to be replaced). When I just turned it on, however, I hear this screeching sound, and when I install something, the fan goes berserk, and the screeching sound gets higher in pitch! What should I do? This never happened before? Is it a hardware problem or is it the software, "Fan Control" from Lobotomo that I installed? PLease help!