Help with spinning gear on start-up

G5, Tiger: after downloading the latest Safari and security updates, when I did a restart the computer appeared "hung" with the grey screen up and gear spinning. After about 20 minutes of this I did a restart and reset the pram and same thing happened. For the last year or so I've heard the fan running while operating (more loudly than on our other G5, Leopard or laptop) but when I put the computer to sleep, the fan quiets.
I did a reset of SMU and tried to start-up with the original installation disk. The computer did start-up but after the Archive and Install page, we got an error message that the system on the disk was older than the one on the hard driver. When it gave me the option to use the system currently on the hard drive for start-up, I chose it and got the spinning gear again.
I have the Leopard install disks from my upgrade of the other G5 -- would it be wise to try installing Leopard or do I have a more serious hardware or software problem to deal with? I've not downloaded the latest Safari and security updates for the other computers since this occurred on restart from that.
Thanks for any help!

So do try the +Archive and Install+ first. If it works, the user data will still be there.
There is another way that might work better, if you have an external FireWire drive that is at least as large as the internal drive (that can be erased).
Connect that drive. Start up using the Mac OS X installation disc. At the first Installer screen, go up to the menu bar and select to run Disk Utility from the Utilities menu.
First, note if the internal drive appears in the sidebar, and if there is a volume (usually called +Macintosh HD+ ) indented under the internal drive (in the sidebar). If there is a volume there, that is good. If there is not, this will not work.
Select something in the sidebar and go to the Restore tab. From the sidebar, drag that internal drive volume and drop it onto the Source field. From the sidebar, drag the volume under the external drive and drop it onto the Destination field. Check the +Erase destination+ box, to make the duplication exact. Note: This will erase the external drive volume and replace it with the internal drive volume.
After double checking to make sure you have the Source and Destination choices correct (and not reversed), click the Restore button. This will duplicate the current internal drive volume onto the external drive. If it works, you will have your data backed up on that external drive.
One thing you can try at this point is to see if you can actually boot from that external drive. Restart and hold down the Option key. This will give you Startup Manager. Select the external FireWire drive (if it appears on the list) and try to continue startup. If that actually works, your problem may be mostly solved. Not only do you have a good backup of your internal drive, but you can use Disk Utility Restore tab again and this time restore from the external drive (Source) to the internal drive (Destination), again checking +Erase Destination+. Hopefully, you will be able to startup from the internal drive now.
Even if that does not work, you can do an +Erase and Install+ on the internal drive. And you have a good chance that the personal data will be on that external drive.

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