Can't boot off YDL 4.1 disc to install

[Graham Wong]

I have a PowerBook G4 867MHz with OS 10.4.6.  I downloaded and burned the
four YDL disks, formatted my drive as it specified in the installation
instructions, and yet my computer refuses to boot from YDL disc 1.  If I
hold down the Œc¹ key at startup my computer still boots off my hard drive.
If I hold down the Œoption¹ key I see the cd but if I select it I get
returned back to the original screen.  What am I doing wrong?
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