Reinstalling Leopard with the Leopard upgrade DVD

[DarkAvenger]

I wish to do a fresh install of Leopard on my Powermac having already gone through the process on my Powerbook. Am I able to reinstall Leopard with the Leopard upgrade DVD (original disc) if my Mac is already running Leopard (10.5.6)? The guy at Apple Australia technical support says there should be no reason why not, yet when I put the disc in my Powerbook and restarted while holding down the 'C' key nothing ever progressed beyond the light grey screen with the dark grey Apple logo no matter how long I held down the key.

In the end I had to resort to installing Tiger (for which I do have the original install DVD). Once Tiger was installed I then put the Leopard upgrade DVD in and restarted while holding down the 'C' key and the Leopard installer appeared after a short time (as it should). I could then upgrade (back) to Leopard. Then it was simply a matter of downloading and running the 10.5.6 combo update. Now my question is did Apple deliberately engineer the Leopard upgrade DVDs so they won't work if you're already running Leopard? I don't see why I should have to go back to Tiger first.

[Huy]

Leopard CPU Drop-In discs only require Tiger and above to be installed before it will work.

If Leopard is installed, then it meets the requirements (10.5 > 10.4) and it will work. I have done this in the past with a Leopard install - used a CPU Drop-In disc (generic) to wipe the system (>10.5.0) and install Leopard (10.5.0) again.

[Beau]

TIP. Select Utilites > Restore from Time Machine Backup, then go back and quit out of that. voila, clean installs, qualifying machine or not

[iJordie]

It works very smoothly, had to do that today, Just used a CPU drop in DVD from a 2007 aluminum imac and put it on a 2006 C2D white iMac


hth
jord

[DarkAvenger]

I can attest to the fact that on my two machines (Powerbook 1.67 & Powermac Dual 1.42) it seems neither will detect and run the Leopard installer off the Leopard retail upgrade DVD if I'm already running Leopard. The disc just spins up then wirrs away for a while then repeats the cycle endlessly (or for however long I'm willing to hold the 'C' key down for). I even tried booting from the disc by restarting while holding down 'Option' and this allowed me to select which device I wanted to boot from, but of course once I continued then again it never got past the Apple logo screen and the disc just endlessly repeated the cycle of spinning up, wirring away for a while then repeating the cycle. After two days I had to resort to using the Tiger install DVD to install 10.4.2. After Tiger was installed only then would my powerbook detect and run the Leopard installer off the upgrade DVD.

Now I can do the same thing on my Powermac and install Tiger first, but really I shouldn't have to so I'm wondering if this is an issue with PowerPC Macs or is there's a weird problem with my Leopard DVD (maybe a bit got set on the disc during duplication that if accidently set won't allow the computer to run the installer if it detects Leopard is already installed on the target machine ie some kind of anti-piracy measure like the region select bits on a commercial movie DVD that if not set correctly will cause the player to refuse to play the disc).