Hi all. So as I was using Safari, I got the spinning beach ball. I ended up having to hold the power button down to shut it off. After waiting 10 seconds, I turned the computer back on, but just got a gray screen, so I shut it down again. The next time I powered up, I got the "question mark" folder. After booting up from my Snow Leopard disk, I was going to run disk first aid, but my iMac hard drive doesn't show up in the side bar. Does anybody know why? Am I screwed? Can I use "restore your system" from the snow leopard system disc? Anybody have any advice? I have an old 2007 20" iMac, 256mb, 3gb Ram, running The latest version of Snow Leopard. Any comments would help! Thanks.