[ElDiabloConCaca]

I think you've run into a catch-22 with trying to install a bootable OS X from an Intel-based Mac onto a PowerPC-based Mac.

In addition, this is probably only possible with Mac OS X 10.5, since 10.5 is the only OS X version thus far that has been sold at retail as a "universal" install disk (meaning it can install on Intel-based or PowerPC-based Macs).

If you have a retail version of Mac OS X 10.4, then you can only use it to install on PowerPC-based Macs, and it won't even boot an Intel-based Macintosh.

If you have a computer-specific version of 10.4 (gray-colored disks), which is what I assume you have since you were able to boot your Intel-based Macintosh with it, then you cannot use it to install on a PowerPC-based Macintosh for two reasons:

1) It's probably Intel-specific, but if we pretend for a moment that it's universal...
2) ...the gray-colored disk's license is tied to the machine that it came with, and can only be used to reinstall the system on the Macintosh that it shipped with (or another Macintosh that's an identical model).