How Do I Repair/Mount my HD if Disk Utility does not work?

My mac mini has recently bit the dust. I did a hard shut down by holding down the power button. Since then I have not been able to bring it back. It started with a folder with a ? in it. Sometimes it sits at the apple logo, and other times it goes to a gray screen and just reboots eventually. I am running Snow Leopard, and I have booted from the install cd. I have tried running Repair Disk in Disk Utility, but I receive the following error: "Invalid node structure Invalid B-tree node size The volume could not be verified completely. Volume repair complete. Updating boot support partitions for the volume as required. Error: Disk Utility can't repair this disk...disk, and restore your backed-up files."

In the pop up window it says "Disk Utility stopped repairing "macintosh HD" Disk Utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. On the left hand side of the window I see 60.01GB ST96812AS Media, and then I see Macintosh HD offset underneath. The Macintosh HD is in light gray and is not mounted. When I try to Mount it it gives me an error and tells me to repair the disk.

My question is do you think Disk Warrior would work or something like that software? I tried to do an Archive and Install, but since the HD won't mount I can't do an installation. Is my HD dead?

Any help would be appreciated!

Sincerely,

Matt