My iMac (24" Aluminum) will not boot.. I tried an SMC reset, and have reseated the RAM. It simply shut off on it's own, yet it didn't feel hot, it just felt as it always has. It's sitting unplugged at the moment. The install disc is inside the drive, but I can't get it to boot to the disc. The drive sounds like it spins, but nothing appears on the screen, and the startup noise fails to play. Everything but power and keyboard is plugged in. Any recommendations as to what to do? I'm afraid of a failed HD (saw that on the web) or Logic Board. I bought it in Feb. but am afraid of the hardware warranty still... Please Help! I need it for school in the morning (if possible).