my first mac and there are already problems. aside from the drone of the right fan and the lcd hiss (which i'm going to ignore), my trackpad was being weird today. i had been using my laptop for 6 hours straight and have an external mouse plugged in. while surfing the web, my pointer on the screen suddenly started vibrating (similar to when one uses the trackpad and an external mouse at the same time with the two moving in opposite directions). then i try to move my pointer using the trackpad and the webpage in safari starts to zoom as if there were another invisible finger resting on the trackpad. it stayed like this for a few minutes before the trackpad finally worked again. has this happened to anyone else? how do you fix it and is it a software or hardware problem?