Laptop is a PowerBook G4 667MHz.
Disk is OSX 10.5; don't know what version.
I know you need to do the following to get Leopard to install on something this old which I've done:
For those with 667Mhz PowerBooks (Or possibly other Macs that don't work with LeopardAssist):
1.) Place the 10.5 Install disk in your drive.
2.) Restart your Mac (don't use on the installer on the disk)
3.) After the chime, hold down COMMAND+OPTION+O+F until you see a light gray screen with black text
4.) let go of the keys and type in the following commands EXACTLY as shown, and hit the RETURN key after each line (you will see an "ok" confirming what you typed was correct):
d# 867000000 encode-int " clock-frequency" property
d# 867000000 encode-int " min-clock-frequency" property
d# 867000000 encode-int " max-clock-frequency" property
Select Leopard Install DVD
After typing "multi-boot" I get the screen in the pic.
...now what? Neither icon seems to do anything.
I know the disk is good and the optical drive is good as I can boot from the disk directly to partition and such. Just can't boot directly to install as you have to do the above first.