Can't get past the spinning gear

My computer is stuck. Won't do anything except show me the gray Apple with the spinning gear below. As it's doing this, the fans slowly ramp up until they're unbearably loud. Hard shutdown, repeat.
Hold 'c' with Tiger CD in drive, no response.
Hold 'Shift' for Safe Boot, nada.
Hold 's' for single-user mode, zilch.
Fans getting louder...
Must reboot.
Repeat.
This occurred after a hard crash. I opened iPhoto, it started to update my thumbnails since I just installed iLife 06, and it froze.
Now it's dead.
This is the 3rd time in 4 months this has happened and the previous 2 times I had to re-install the OS. But none of the methods of installing are working (keyboard entry during startup).

I saw a G5 recently which was having this problem.
The person shut down the computer waiting for me to turn up and when I did and he switched it on again, it worked.
Try shutting down the machine and switch off at the wall.
Startup the computer again holding down ShiftApple+PR keys until you hear the chime 3 times, then see if it initiates a proper startup.
If it was a hard crash you have had then it is likely the directories have become corrupt, or slightly worse the system itself.
If you can attach another Mac which has the same system version installed via firewire and startup the G5 into Firwire Target Disk Mode. You could run Disk First Aid via Disk Utility on it.
Mark

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