I was working on an ibook and messing with it in firewire mode and was going to install leopard on it that way. I tried to restart my machine and boot leopard both by pushing C and by running the installer. I get the "You need to hold the power button panic message" everytime I do this. I unplugged external devices and tried this also and it has the same problem. I cannot boot from the dvd anymore. If I eject the disc, osx loads normally. Any ideas what I can do?