Can you downgrade from Snow Leopard to Leopard if MacBook Pro is shipped with SNL

I have recently purchased a MBP with 10.6.8 already installed but it came with no disks and i wish to fromat to get it truley cleaned up. I have my shop bought Leopard i pruchased for my Imac and my leopard disks that came with a later MB, when i insert the leopard disk when booted it reads ok hit the install button MBP reboots but just sits with white/blue screen and nothing happens. Tried rebooting and holding C still nothing happens apart from the MBP does not boot up but hangs. Tried pressing alt at boot up and the option to choose the disk appears I select it nothing happens yet the mouse no longer moves, it just sits there. The disk is fine as i used it to reformat a friends MB 1 hour before i attempted mine.
So if the MBP came with SNL already installed can you not roll back to leopard, or is there something I'm missing.
model: 15.4 MBP 2.8ghz core duo 500hdd 4gb ram etc...

Hi all
Ok so I went ot the local Apple shop and they have stopped stocking SNL but advised i can download Lion and install and even though it didn't format i could when installed boot to the recovery partion -utilities and erase from there and then do a full install thus allowing a full format.
So erase done click install lion and it connected to the net and then sat for some time so what i'm asking is does this now have to down load the 4gb image again. I assumed it installed from the partition but will it download and install if so this could take some time as the Lion download took approx 8 hours.
Please tell me that is not the case as that is seriously flawed and left me in a dodgy position as i have erased my hdd and will have to wait till i can get a day off to run the next install.
as a foot note i was advised to copy the image and then burn so i would have a hard copy i did this would it be quicker to do it from thi disc.
thanks in advance

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