I just got my ibook yesterday, fully charged the battery and am typing on it right now. The problem is after waking it from sleep, there is this little buzz or whirring sound coming from the right. It sounds like there's cd-rom inside my combo drive or my hard drive spinning. I shut-down the computer, restart it, and the same noise occur during start-up. And its pretty loud. Since this is my first mac, I don't know if this is normal or not. Should I be concern and take it back to the apple store and have them check it?