No.That means flashing the bios and make it a newer model than it is ? I did that with an early intel mac mini some years ago so that i could put in more memory, also i changed the CPU from a single core 1.8Ghz to a core 2 duo 2.16Ghz.. wow what a difference it made..
That means using things like LeopardAssist, or using a different Mac to install Leopard (one that is officially supported) on to the HD.
BIOS is an Intel PC thing. While a PowerPC Mac is a PC, it is not an Intel Mac.