Disk utility can't find the hard drive

I'm getting the flashing question mark when I try to start up my computer. I tried to use disk utility (starting the machine from the system software CD) to diagnose the problem but it wouldn't even find the hard drive. Any suggestions? Any help greatly appreciated!

Nothing at all, Tony. When I came back to work on my computer after a 30-minute break, one of the applications was frozen. Soon after, everything froze. After restarting, the flashing question mark came up. I was able to boot from CD but when I tried to run disk utility it wouldn't find the hard drive. At this point I'm at a loss and I'm worried about my data, which, as it happens, I hadn't stored elsewhere! Any suggestions?

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    Version:1.0 StartHTML:0000000105 EndHTML:0000004136 StartFragment:0000001438 EndFragment:0000004100                    
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