Try unplugging all Firewire/USB devices. Also, unplug the power cord from the computer. This resets the logic board. If that doesn't isolate the problem, put your Original system CD that came with the computer and hold down the C key. Boot up and run Disk Utility. Run the repair disk and then repair disk permissions. Reboot and try booting your system again.
Trying booting from the Mac OS X install disc.
insert the Mac OS X install disc.
press the start button while holding down the "C" key on the keyboard
If it boots normally from the disc. you have a bad hard drive and it will need to be replaced.
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