10.5.8 no longer boots but 10.4 does

I get a grey apple and spinning gear, forever. I tried many suggestions (Safe boot; reset SMC; unplugged everything; boot from Leopard CD and ran disk utility - all ok but then I can't boot back from main drive.)
I get some clicking as if something is about to happen, then one click and a whooshing sound (spinning down?) Then endless grey apple and spinning gear.
I have another internal drive and it has OS 10.4 on it. I CAN boot from that - which is where I am now. But I can't use Disk Utility from it to do anything on the Main drive, I doubt that would do much anyway.
I've had Leopard (10.5.8) running on my Mac Pro for over a year. Recently I started getting stalls and freezes. I thought it was my 3rd internal drive, a WD500. After trying everything to fix it, I pulled it out (am awaiting a new WD 1TB Black and a Seagate Barracuda 1TB-snow delayed delivery).
But...apparently the drive was not the problem because I started getting odd behaviors including not being able to get out of screen sleep mode, and some delayed responses.
Ran Disk Warrior. Rebuilt Main drive (with OS 10.5.8 on it); even shifted RAM risers and pulled out some RAM chips to see if that made a difference..
But could not get restarted.
Which brings me back to up top of this post where I started.
Can anyone help me with this? It's as if Leopard went bad, not the drives. The machine itself (this Mac Pro 2006-2007) is working right now with OS10.4.
Frustrated and drained...

Thanks for your patience and the info you provided. All helpful.
I'm almost ready to click "solved" but want to see if this last thing I'm trying does in fact work.
I've done so many things over the past 8 days that it's too much to detail and hard to be sure which has been the fixer. Likely it's a combination of things.
In short: I believe one of my hard drives; my install disk and some specific files all came together in a perfectly bad storm.
While booted in Tiger, with side door open on Mac Pro, I slammed in what used to be my Main HD with Leopard. Surprisingly, it popped up. I grabbed what I could. Ran Disk Utility; Disk Warrior on directory, files and hardware. All said ok--but clearly is wasn't.
I bought Super Duper and attempted cloning. In doing so, it failed, BUT, the failure log was very helpful in that it showed me where and when the failures were occurring. Then, I made files visible (using "InVisibles") went in and trashed those files. I kept repeating this until Super Duper succeeded in creating a clone, onto one of the new hard drives I had just installed. THAT clone actually allowed me to boot back into Leopard. Meanwhile, I used my laptop to create a disk image of the Leopard install DVD. I brought that over to this machine via a firewire external. I used disk utility to "restore" it to a partition on one of the new drives. I now plan to use that to install a new version of Leopard on yet another new drive. If that works I'll call this solved.

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