G5 freezing - no problems with ASD - crashing also in single-user-mode

Hello,
I have a PowerMac7,1 with MacOS X Server 10.5.8, which today started freezing and restarting.
After the system froze, sometimes it restarts automatically, or I have to manually reboot it with the power button. In both cases the restart also froze!
The only way to start the system is the clean the PRAM, but after a while it is crashing again!
I managed to run the full ASD 2.5.7 test without error for a few hours (then I stopped), and with the install DVD I also managed to run the system repair (there was nothing to repair).
Both from the system and from the install DVD I cannot run the repair permissions (it freezes!). So I tried to execute "fsck -fy" from the single-user-mode, but the computer froze again!
Is there something else I can try?
Thanks a lot!

Two things: DiskWarrior. New HD.
It seems that the crashes are coming into play when the HD is in the game in a meaningful sense, which isn't the case with the install disk or ASD, unless you are trying to do something like disk repair or permissions repair from the install disk. What's interesting is that you can boot into single-user mode, but when you invoke fsck, you crash, whereas disk repair from the install disk, which in essence fsck, runs and reports no errors.
You can also try a safe boot and see how things run there. If you can do that, I would suggest running AppleJack on the system, if you can.
Finally, it's possible that NVRAM has gotten corrupted (a possibility but not a high possibility) so an NVRAM reset might help things out.
After trying the safe-boot and NVRAM routes, if no help, my next tool would be DiskWarrior. In the past, I have had situations where DW found problems that Disk Utility didn't find, though that was in DW 3, probably. Fortunately (knock on wood) DW 4 has not had to confront a disaster situation yet for me.

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