My 12" powerbook, about a year old, no applecare
the other morning it was running insanely slow. i rebooted, it just hung at the apple. booted my tiger CD, ran disk utility, fixed something about an index error, now all is fine. except when i tilt the machine slightly, if i put my ear by the HD, i can hear it whirring, almost like it's working overtime. i never noticed this before, is it normal? when i tilt it back to flat it goes silent again.