Single User Mode: Searching for root...

My 2 year old unplugged my PowerMac iMac G5 (single) and now it won't start up.
I was finally able to boot up off of Disk Warrior and replace the directory, but it won't start up past the gray Apple screen. The fan comes on after about 45 seconds and blows hard. Then, I get the circle with a line through it, in gray. I've never seen that on a mac.. the international "no" sign.
When trying to start up in Single User Mode, I get a long list of stuff either disabled, not found, missing etc and then it starts writing to the screen every 30 seconds a line like:
Still searching for root.
I've tried pulling the back off, resetting the SMU, starting up in Safe Mode, etc.
This has happened with storms before and I can usually get it back.
I don't have original install discs.

When you say you have "OSX" but not the "original install disks" do you mean the mac originally came with an earlier version and you don't have those disks, but you have a retail copy of Tiger?
The circle with the slash means that Open Firmware cannot find BootX. Basically, I think this means that Open Firmware recognises the startup volume as such but cannot hand control to the operating system at all. BootX is what it uses to get the operating system going. Without this, as you've seen, you cannot make even single-user mode.
What is SMU?
*Is your data backed up? If not, prioritise that unless you can afford to loose it.*
Does DiskWarrior repair permissions? If not and you have the Tiger retail version, try running Disk Utility to do that. I don't think this will help, but it won't hurt.
Do you have another Mac? If so and you have the retail Tiger, you might be able to use Pacifist to replace BootX (in /System/Library/CoreServices). Alternatively, if the other Mac is running the same version of the OS and is also a PPC Mac, you could try copying the file from that machine.
Before you do any of this (with the exception of the permissions repair), try to backup any data you need if that's at all possible.
- cfr

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