Currently Being ModeratedMar 14, 2013 7:57 PM (in response to JCB617)
That you're using a disk which is specific to the Mac model it shipped with. Apple never released 10.5.2 on a retail DVD.
You need to buy a retail Mac OS X 10.5 DVD from a source such as Amazon or eBay.
Currently Being ModeratedMar 14, 2013 8:01 PM (in response to JCB617)
You need a retail version of the Leopard installer disc. You might try calling AppleCare Support: Customer Service: Contacting Apple for support and service - this includes international calling numbers. Sometimes they have copies available - price is $129.00. Alternatively, search on eBay, Google, and Amazon.com for copies. Be sure to only purchase the retail disc set.
Currently Being ModeratedMar 15, 2013 6:36 PM (in response to JCB617)
Mac OS X 10.5 Leopard installation system requirements
Look on eBay or Google the installer part numbers to possibly find at an on-line store. Here's what to look for:
MB427Z/A Leopard 10.5.1 install DVD
MB576Z/A Leopard 10.5.4 install DVD
MB021Z/A Leopard 10.5.6 install DVD (single user)
MB022Z/A Leopard 10.5.6 install DVD (5-user family pack)
Installing Mac OS X 10.5 Leopard
Mac OS X 10.5 Leopard Installation and Setup Guide
After you install the base 10.5, download & install the 10.5.8 combo update at http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update
The DVD should look like this
Caution - Leopard does not support classic mode. So, if you currently open OS 9 apps in classic mode, you won't be able to do this if you upgrade to Leopard.