What exactly is the boot sequence for OS X? On a PowerMac 6500 (pre-G3): Accidently booted off OS X cd (using c key). Thought it would just spit out CD at worst. Computer died. Tried rebooting: Computer now starts and then IMMEDIATLY shuts off. Don't even get gray screen. Booting off CD, zapping PRAM not work. Green indicator light on computer never comes on, although all devices are receiving power, and continue to have power even when computer is "off." Why can't the 6500 even boot off the old OS?