Yesterday my MacBook froze up, and when I tried to restart it, I heard a clicking noise and then got a white screen with a blinking question mark (kernel panic screen, I guess). This kept happening for several attempts. I assumed these symptoms meant that my hard drive was cooked. However, several hours later, I tried it again and it suddenly started working again, and I'm sending this message on it now. But am I right to think there's probably something wrong with my hard drive? If so, aside from the obvious "do a backup asap," I'm wondering what exactly to do. Has anyone else had this experience of having what appeared to be a hard drive crash, and then had things start working again? If so, was it a temporary thing or did your drive in fact go bad?