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Simple answer: You can't. As a general rule, no Mac will boot with a system older than the one it came with.<br />
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Why do you need to install Tiger?
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I ordered 13 of these for work and have opened 3 to setup. But they are having an issue with the mac shares on my servers running server 2003R2. 
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Have you updated them to OS X 10.5.4?
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thanks that helped with the AD integration..
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I have a brand new 17&quot; iMac G5 2.4GHz with 1GB ram preinstalled with Leopard and I want to downgrade to Tiger. I bought a Tiger install disk but it will not boot to it from startup menu or holding down the &quot;c&quot; key. I need a way to install Tiger on this machine
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I have a brand new 17" iMac G5 2.4GHz with 1GB ram preinstalled with Leopard and I want to downgrade to Tiger. I bought a Tiger install disk but it will not boot to it from startup menu or holding down the "c" key. I need a way to install Tiger on this machine

Downgrade from Leopard to tiger

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.