Powermac G5 will not boot after 10.5.6 install

I recently inherited a Powermac G5 with 8gb ram(recognizes 6) 2x150gb HD which was at 10.5.8
HD1 was 10.5.8 HD2 is setup as backup
most apps would not launch so decided to refresh and start over by erasing and installing anew 10.5.6 and going from there.
after install on HD1 and reboot the screen would hang at the grey screen with the Apple logo and spinning circle
did option boot and selected that drive and system would barely get to the gray screen and shut down
installed on HD2 and again it gets to gray logo screen and just spins(let it go for many minutes)
any ideas?

Hello Dane,
I think we should start by finding out why only 6 GB is recognized out of 8 GB, if we have a RAM problem then we're not likely to get a good Install.
Maybe try one Pair of RAM sticks at a time.
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
We're interested mostly if it finds errors.

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1. Is it possible that the data and the Apps have been restored but the OS is simply corrupt on the TM?
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