I have a brand new Mac with OS X Lion on it. I would like to have a 200 gig partition with Leopard on it (I have the discs). When I insert the disc, upon bootup it just gives me a black screen with lots of white type. At that point nothing happens, and typing does nothing. Any ideas? Do the new Lions just have everything put in place to not allow you to do anything except Windows 7?
New Macs are always locked to only working with the OS version they shipped with, or any later version.
Earlier versions of the OS don't have drivers for the I/O devices in your machine anyway, and there's not as much ability to download OS X drivers direct from the chipset manufacturers like you can often do with Windows.
You can't just take the [Mountain] Lion drivers and copy them onto Leopard and expect them to run, because they were developed and compiled against [Mountain] Lion-level APIs.
If you want to run an old version of OS X, you pretty much have to use an old Mac.
You CAN install both Lion (10.7) & Leopard (10.5) on a single system.