A little over two months ago I came home to find my iBook making very loud noises, and after trying to restart, it wouldn't boot up again. Tekserve examined it and determined that the problem was caused by a software corruption and there was nothing wrong with the drive, so they reformatted and did not replace the drive. Now I hear [much fainter] the same sounds, and I'm getting very nervous. I'm afraid that if I restart or shut down my computer it will never come back on again, as the last time this happened. Does anyone have any suggestions? I'm very scared.