Start up freezes on OSX screen

HI There.
Came into work this morning to a imac having problems. The screen seemed fuzzy/blurry to me as I sat down to get to work. No mouse control so I re-started.
When it reaches the "starting Mac OS X window the blue bar fills up and then it just sits there.
I have unplugged everything and restarted. Nothing.
I have inserted the original start up CD and held the C key and the tray ejects the CD and will not boot up from it.
I have tried to start up from the Tiger CD and the tray opens and ejects the CD again.
Does anyone have any suggestions?
I am on a imac G4, Lots of memory running the latest version of Tiger.
I am somewhat experienced Mac user so I do not think this is something simple. The computer has never given me any problems since day one.
TIA
Darty

First off, see if using the Startup Manager works better than using the 'C' key trying to startup the Tiger disk (I assume you are using the retail Tiger disk). If it is one that came with another Mac, then it might not work with your Mac and could be the source of your problems in how you installed Tiger. Let me know if that's how you installed Tiger, and disregard the other directions, as we will need to try something different. It is activated following these instructions:
http://www.info.apple.com/kbnum/n106178
Once the Tiger installer has booted, go to the Utilities menu, select Disk Utility, and select the hard drive if it is visible. If it isn't visible, let me know and we can try something different. Click on First Aid, and click only on Repair Disk. If there are errors with Repair Disk and it is not repaired or does not appear to be OK, let me know. If it is repaired or appears to be OK, try restarting the computer again by quitting from Disk Utility and then the installer.

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