Mac OS X 10.4 Tiger Install DVD ejects
Summary
If your Tiger-compatible Mac has an Apple SuperDrive (an optical drive that can read and write DVD discs) that unexpectedly ejects your Mac OS X 10.4 Tiger Install DVD when you insert it, you might need to update your firmware. This document applies to iMacs and Power Macs with SuperDrives (that came pre-installed in the computer).
For more information, please refer to one of the following links, depending on which Mac you have:
Products Affected
Mac OS X 10.4
The issue occurs even with the latest SuperDrive firmware installed
This is an unlikely situation, but if it happens to you, check out Troubleshooting Mac OS X installation from CD or DVD.