You may have more bootable disks to choose from if you have more than one partition on your hard disk.Using the arrow keys, move to the Leopard Install DVD and hit Enter. One of which will be a picture of a hard disk and another of the Leopard OS X Install DVD. Hold the Option button down until you see a grey screen with two (or more) options displayed. If for some reason your Mac doesn’t make a noise when you boot up, just press and hold the Option button when the screen lights up. When you hear the power-on “chime”, press and HOLD the Option button (just left of the Apple/Command key, also known as Alt or two horizontal lines, one diverging before connecting with the other). After your Apple has shut down fully, press the power button to start it. Shut down your Apple computer (don’t use restart). Insert the Leopard install DVD into the dvd drive.
The best way to do this is with an external drive connected to your machine via FireWire or USB 2.0 and using cloning software such as SuperDuper! Step One: Boot from Leopardīoot from the Leopard install dvd to allow repartitioning your Tiger-installed hard disk without erasing the disk first. Always Always Always make a backup before you try any shenanigans like I do below. The following is a summary of how I created a dual boot setup of OS X Leopard (10.5) and Tiger (10.4) on a MacBook Pro, keeping the original Tiger installation intact and available through alt/option booting during system startup.
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