I recently installed a used hard drive straight out of my pc into my imac a1207 which had a failed hd. I haven't done anything to prep the hd, figuring I would install snow leopard and erase anything on it as well as format it. I tried booting from the disc by holding "c" after the chime but after a couple minutes or so, all I get is a flashing icon of a folder with a question mark inside. This being my first mac, I have no idea what's wrong. I believe the disc is good as I used it with the old hard drive and installed it correctly before it died. I sure would appreciate any advice for this pc user trying to make the change to mac!