OSX system and installation disk won't boot
It could be a hardware problem or a media problem. You might have a defective DVD drive in your MacBook Pro, or your installation DVD could be scratched or corrupted. You might need to take the unit to a qualified technician who could try the installation with a known-good 10.6.x installer DVD to isolate the problem.

Also, is the installer DVD for 10.6.4 the same one that shipped with the computer? If it is a replacement that you got from elsewhere, it may not be the right version number to work with the firmware and version of your particular model of Mac. I have seen that problem arise before. Some Snow Leopard installer DVDs were 10.6.0, and some later ones were 10.6.4, and certain models of Mac would not accept an installer DVD that was 10.6.0 and not 10.6.4.