MBP 2.4GHz Core 2 Duo - Backlight off when booting to restore DVD

Hi all!
I have a very interesting issue and I'm not sure what to make of it.
I have a MBP 15" (Core 2 Duo, Aluminim, NOT unibody) that shipped with 10.5. I am restoring the OS with a 10.5 upgrade DVD (was not able to find my original restore disc for the unit). Unit boots into the OS properly, all hardware works to spec. However, when I boot to the DVD, the backlight goes out once the DVD is done loading. There's no inconsistency, it doesn't "come back on if i wiggle it," nothing of the sort. If I cold boot the laptop and restart, the backlight works without issue. Any ideas on what's causing this?
Thanks!

Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.

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MBP 2.4GHz Core 2 Duo - Backlight off when booting to restore DVD

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