System won't boot after update

After installing the latest system update (from Leopard 10.5.1 to 10.5.2) on my Dual Processor PowerMac G5, I was able to restart then within 2 minutes a freeze. I couldn't force quit...had to power done.
Upon powering on, my screen hangs on the gray screen for about a minute (with the clockwise powering up status symbol), then it shuts down on its own. It won't boot into safe mode. In single user mode, it tells me there is a "disk0s2: I/O error" ... Is my hard drive dead? I've tried resetting the PRAM, resetting the PMU button, unplugging all 3rd party devices, but to no avail.
I'm hopeful I can recover files somehow. Where should I proceed? I'm not sure exactly how the internal drives work. Can I, for instance, unplug and remove the top internal drive and place the 2nd internal drive where the top one was and see if i can boot from that drive?? Thereby determining which drive has the issue? Any advice is appreciated.
Thanks so much!
Sean

Can you boot off the leopard DVD and run the disk utility disk verification on the drive? If it's a hardware problem then there's probably not much you can do. If you have a TM backup of your system then you should be ok, since you can replace the drive and then restore your system to it from the TM backup.

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