G5 Power Mac Wont Boot

Hello, all.
I'm trying to fix a G5 tower, power pc with issues booting. The owner was browsing a large folder of images when, suddenly, the pinwheel of death began spinning without end. He had to reboot the system. When he now boots the system, there is the white/grey screen with the apple logo and the fans go on overdrive after several minutes of idling on the screen.
When we booted from our 10.4 disk, we could not repair or verify our hard disk. It said that the disk could not unmount. We even installed a brand new hard drive, but we couldn't install 10.4 on it. We even tried to verify the new drive after the failed installation and we got the same "unmount" error.
I'm not sure what to do. I've searched and browsed other posts, but I can't seem to find any similar issues. Perhaps someone can help?
Thanks,
J

Hi Jeremy, did you pull the old Drive when trying to Install to the new one?
If you have anther Mac With Firewire, you might try putting the G5 into FireWire target disk mode...
http://docs.info.apple.com/article.html?artnum=58583

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