Why won't my original Tiger discs boot on my Macbook Pro, and why can't I reinstall Snow Leopard using other discs?

I have 17" MacBook Pro 3,1 I am trying to reformat so I can sell (I recently bought a 2011 MBP). I had upgraded the OS to Snow Leopard, but the original discs are for Tiger. Of course, now I'm searching high and low for my Snow Leopard upgrade disc, but can't find it. I decided to try and boot from the Tiger discs, but when I did, all I got was a screen that looked like a blizzard of pixels. I was able to boot using the Snow Leopard disc from both my new MBP and my girlfriends MB, but both said that OS X could not be installed on this computer, and I couldn't even use the disc utility to wipe the drive.
After reading a few of the questions on here, I went to my hardware overview to double check the product line for the computer. When I did, I found that my serial number is missing. Apple recently replaced the logic board in the computer (the nVidia graphics card melted, so nVidia floated the bill, even though the computer was long out of Apple Care), so I'm wondering if that's why my serial number is missing. Do I need to have a serial number to reinstall OS X? Am I in deep deep trouble?
I appreciate any and all help, thank you all in advance!

Pyralus wrote:
I decided to try and boot from the Tiger discs, but when I did, all I got was a screen that looked like a blizzard of pixels.
The firmware was likely changed and it's not compatible anymore or the disk is bad.
I was able to boot using the Snow Leopard disc from both my new MBP and my girlfriends MB, but both said that OS X could not be installed on this computer, and I couldn't even use the disc utility to wipe the drive.
Those disks don't have the hardware drivers your machine needs.
Your going to need to get a Snow Leopard retail install disk from Amazon/elsewhere.
Do I need to have a serial number to reinstall OS X?
Thankfully No.

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