Hi, just a question.. I was using my family's PowerBook G4 today and starting to type in the address for gmail when it froze and went to the spinning beachball. I thought Safari had just frozen so I went to Force Quit but I couldn't click anything and eventually I couldn't even move the beachball. The whole time the computer was making odd noises. Finally I held the power button to turn it off and tried starting it. Sometimes it gets stuck on the gray apple, sometimes on the 'Starting Mac OS X' screen. I've tried holding shift while I start the computer, it just turns itself off. Holding option while I start it takes me to a blue screen with an HD icon that says 'Macintosh HD' I think, with an arrow curved into a semi-circle on the left side of it and a straight arrow that points right on the right side of it. I tried clicking the left arrow and nothing much happened, tried clicking the right arrow and it brought me to the 'Starting Mac OS X' screen again, where it got stuck. Any ideas on what I can do?