Dead 2008 Mac Pro with Soft Raid - Diagnostic Ideas?

I'm starting to run out of ideas how to diagnose and fix my 2008 (March) Mac Pro: Dual quad-core Xeon, 2.8GHz with a 2TB four-HD soft RAID.
I think it died of a bad or partial or otherwise failed update of Mavericks. Since Mountain Lion, I think it was, soft RAIDs no longer support Recovery Disk partitions, but I have a Recovery Disk on a USB thumb drive, created on my MacBook Pro running Mavericks. The MacBook Pro can boot from it, so I'm confident that it was created successfully, but no luck booting from it on the Mac Pro.
Below is what I've tried along with the results I got, pretty much in chronological order. Any of you have any other ideas?
Experiment
Result
Normal boot from soft RAID
There's frame-buffer-memory garbage (largely quasi-random noise) at the top of the screen. The grey Apple logo came up offset to the right of the screen, with the spinning thingie below it. That spinning thingie (I forget what it's officially called) spins for about the right amount of time where it would start drawing the desktop, but instead it freezes up, and then I start seeing flashing orange stripes on the screen. The disk keeps cranking for a while.
Powering up in target-disk mode, over Firewire
Works normally, and I in fact successfully backed up the RAID that way to a 2TB USB drive, using the MacBook Pro.
Zapped the PRAM, then normal boot from RAID
The only change was that there is less frame-buffer-memory garbage at the top of the screen, and the Apple logo and spinning thingie is now centered again. Other than that, the failure to boot happens identically.
Boot with option key down and Recover Disk USB thumb drive in the front USB (on the Mac Pro itself; no USB hubs intervening).
It boots up showing icons for each of the four disks of the RAID, but does not show the recovery disk. (Doing the same on the MacBook Pro does show the recovery disk, and I am able to boot from it on the MacBook Pro.)
Booting with C, since I gather that that could also tell it to boot from a USB drive.
It did not boot from the USB drive.
Booting with D, to try to get it to run hardware tests.
No effect; still fails to boot in the usual way.
While connected to the MacBook Pro in Target-disk mode, running Disk Utility looking for disk problems.
No problems found. I have a Mavericks version of DiskWarrior on order. Should be here in a day or two.
I haven't tried any network boots, since I don't know of any network drives to boot from, and I'm not sure if it would do any good anyway.
I really doubt if this would work, but one ... conceptual ... way to replace the OS on the RAID might be to connect the RAID, via target-disk mode, and buy (again) Mavericks (or Yosemite?) from the App Store, and then tell it to install it on the RAID rather than the MacBook Pro itself. The problem with that, I imagine, would be that after loading it onto the RAID, it would presumably perform an installation appropriate to the MacBook Pro rather than appropriate to the Mac Pro. So, I'm not desperate enough to try that yet...

Just how did you create the recovery disk on the thumb drive? Maybe it is unique to the laptop.
"but I have a Recovery Disk on a USB thumb drive, created on my MacBook Pro running Mavericks."
If y can download the Mavericks installer on your laptop y can make a Mavericks bootable installer with
http://liondiskmaker.com/

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Raidsets      Type       Drives       Size      Size Comments
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Drives Raidset       Size      Flags
Bay #1 RS1             2.00TB   IsMemberOfRAIDSet:RS1 IsReliable
Bay #2 RS1             2.00TB   IsMemberOfRAIDSet:RS1 IsReliable
Bay #4 RS1             2.00TB   IsMemberOfRAIDSet:RS1 IsReliable
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Power Pig wrote:
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                                     Total     Avail
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I was talking about this.
This looks like a RAID 5 setup without the parity to me. I would said it basically a RAID 0.
Also you metioned "I guess that previous spare must really have gone 'bad', despite having never been used! "
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RS1           RAID 5     1,2,3,4    5.23TB    0.00MB No tasks running
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I posted this in some other blog (forum), I should have posted this here also but I hope this gives you and all with these problems hope!! I also ran some fish tank test some else posted to get the folding problem to happen and I can not get it to happen at all now, and since my 8800 went in I get NO LOCKUPS, SCREEN FREEZES, shaky blurry video when I boot, so far NOTHING, IT JUST WORKS!!!!!!!!
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I have read others that swapped with the 8800 and their problems went away also!!!!
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I recommend Mac's to everyone now!!
good luck and let me know it any of this has helped!!!!!!!!!!

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http://www.bing.com/search?q=Intel+Harpertown+5400+stepping
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Dead 2008 Mac Pro with Soft Raid - Diagnostic Ideas?

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