Flashing question mark folder- Mac Help instructions arent working

My computer froze yesterday and when I re-started it, it had the flashing question mark folder.
I tried all of these steps http://support.apple.com/kb/ts1440
and these steps http://support.apple.com/kb/TS2570
I can't get anything to pop up upon start up other than the folder (ie when I hold down the C key with the Instal DVD in it thinks for a minute, spits out the DVD and the folder comes back).
If anyone has any ideas I'd greatly appreciate it.  I'm even fine with erasing my hard drive if need be, I just want to get the computer back up and running.

You can go no further unless you're able to boot from your installation DVD. If your machine came with Snow Leopard installed, that would be the gray disc that was in the box. If you upgraded to Snow Leopard, then it would be the retail disc you used to upgrade. No other disc will work.
With the machine powered on, insert the disc. Hold down the power button until it shuts off. Press the power button again to turn it back on, then immediately hold down the C key. Keep holding until you see the Apple logo on the display.
If this procedure doesn't work for you, and you've done everything you say you've done, then you have either a hardware fault or a damaged disc.

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    Message was edited by: Grant Bennet-Alder

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