Os 10.5 install failure computer will not boot

acquired a hand-me-down G4 and went to upgrade the 10.4.11 os to 10.5. I had planned to do a archive and install because I dont have software disks for many of the applications, however, I never even got that far...
put in the 10.5 disk, it loaded and I clicked install, it promted a restart, and hasn't booted up since.
It just spun and spun, I thought maybe it would just take a while, so i let it run, and frankly I forgot about it and came back an hour+ later. still spinning.
powered it down by holding the power button. turned it on again and it shut itself off...x3. I figured maybe there was a problem with still having the install disk in the drive so i used my handy-dandy paper clip and ejected the disk.
so now it will turn on and stay on, buy just shows the old OS9 logo with the 2 faces and a question mark.
what is going on? can i just go back? i have my 10.3 disks, but no disks for 10.4.11. (maybe that was a downloadable upgrade?)

You may have to reinstall, but first...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If all the above fails, then it appears to be time for an Archive & Install, which gives you a new/old OS, but can preserve all your files, pics, music, settings, etc., as long as you have plenty of free disk space and no Disk corruption, and is relatively quick & painless...
http://docs.info.apple.com/article.html?artnum=107120
Just be sure to select Preserve Users & Settings.

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Os 10.5 install failure computer will not boot

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