<UL>
<LI>Insert the DVD into your machine.
<LI>Boot into the bios and select the first boot device as your optical drive to allow the system to boot from the DVD.
<LI>If all goes well the Mac OS X installer will appear. Select your language and wait for the next prompt.
<LI>At the top of the screen you will see a menu, go to 'Utilities' and select 'Disk Utility'.
<LI>Once in Disk Utility select the drive you wish to install OS X onto - this is visually represented in the left hand pane.
<LI>Once selected look for 'Partition' and 'Options', use either 'GUID' for EFI or 'MBR' for Master Boot Record, then press 'OK'
<LI>Name your new Volume as Leopard and format it using Mac OS Extended (Journaled).
<LI>Quit Disk Utility and wait for the Installer to reappear. Follow the prompts then select the drive you have just initialized.
<LI>Choose the 'Customize' option and select/deselect the packages you wish to install. Ensure that you select the appropriate boot loader and that it corresponds with the settings you chose earlier in the partitioner.
<LI>Once you're happy with that press 'OK'.
<LI>Depending on your system speed the install can take anywhere between 30 mins to an hour, so go have a cup of tea or coffee...
<LI>Once installed the system will automatically reboot and take you into the welcome screen and user account setup.
</UL>
After all that you will most likely have small things that may or may not work correctly, so you'll need to search and dig around for information.

Good luck.

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MacBook Pro 15" | Mac OS X 10.6 • 2 GHz Intel Core Duo • 2 GB DDR2-667 • ATI Radeon Mobility X1600 128 MB • 100 GB Serial-ATA
Hackintosh | Mac OS X 10.5.6 • 3 GHz AMD Athlon 64 X2 6000+ • MSI K9N AM2 • 2 GB DDR2-667 • NVIDIA GeForce 8800 GT 512 MB • ALC888 Audio • 300 GB Serial-ATA
iPhone 3G • 8 GB