How do you re-install the startup software?

After hitting the power button I only get a black screen. I shutdown and restart a few times and then get the fuzzy gray screen with the spinning wheel ...
I get this problem regardless of what startup disk I used (hard drive, mac os x install cd, or no startup volume). So I think re-installing the operating system on that hard drive probably won't fix it (?). If not, how do I re-install this startup software?
Thanks for any info.
imac g5    

To clarify:
You insert the OS X Installer Disc that came with the computer into the optical drive. You restart the computer and after the chime press and hold down the "C" key. You release the key when the spinning gear appeared below the dark gray Apple logo. Am I correct? If so, then you say the computer still will not start up from the Installer Disc? If this is correct then take the computer to an Apple service center for repair.

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