Mini won't boot - tried many methods, disk visible in Target Disk Mode

I have a PPC Mac Mini running Leopard. It stopped booting last week. It goes to the point where the Apple appears and then stops. No moving ring at the bottom of the screen.
I've done the following w/ no luck to get it booting.
1) Put it in Target Disk mode and run Disk Utility. Repaired permissions and did a Repair Disk. No issues found.
2) Put it in Target Disk mode and ran Tech Tool Pro. Checked volume/file structures and sectors. Nothing found.
3) Reset PRAM.
In Target Disk Mode, I can see the files. But I want to get it running one last time to archive some program configuration files. I know I can erase and restore from a TM backup but I'm using that as a last resort. Other than trying Spinrite, any other ideas?

You must be very keen on those config files. You are going thru a lot of work to get them. But if you must ...
If you have an extra firwire external drive free, that you can partition with APM (Apple Partition Map) and format, then you could use your original install disc or Leopard install disc to install a bootable version of OSX on that external.
Boot from the external, and then download the latest combo update for Leopard and install it on the internal drive. Hopefully that will fix the the internal enough to make it bootable.
Another approach is to pay $100 for DiskWarrior. Most of the time it can fix a problem like yours ... but no guarantees. It is a worthwhile program to own anyway, however.

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