There are a lot of aluminum models. Leopard can run on any model PB starting with a
Model Identifier PowerBook3,5
So, open Apple System Profiler in the Utilities folder and see what is displayed as your Model Identifier. If you have 3,5 or later then you can run Leopard provided it meets all the other system requirements for Leopard.
Leopard System requirements
You must have a Macintosh computer with:
- an Intel processor or a PowerPC G4 (867 MHz or faster) or G5 processor
- a DVD drive >built-in FireWire
- at least 512 MB of RAM (additional RAM is recommended for development purposes)
- a built-in display or a display connected to an Apple-supplied video card supported by your computer
- at least 9 GB of disk space available, or 12 GB of disk space if you install the developer tools
Apple discontinued selling PowerBook batteries and power supplies over a year ago. You need to find one elsewhere or go third party:
I bought one of these for a friend and it works perfectly.
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.