Booting Off of Leopard DVD= No Backlight- PLEASE HELP

I'm running my copy of Leopard to reinstall the OS and for some reason the backlight will not come on when it boots into the DVD. I do see the screen though, its just very dark...
Other than that, the screen and backlight work as normal when I just boot into the OS already on teh computer...
Please help. Thank you.

I never got it to work, but this is what I did:
Booted off the DVD and used a bright flashlight (LOL) and went into the firmware password utility (before reading your post above, ugh) and got rid of the pw. Then reset the PRAM and SMU, which also did not work. I just did the reinstall of the machine with a flashlight up to the screen and the computer is running fine.
I haven't tried booting into the DVD again, so I don't know if its fixed or not. VERY WEIRD- I have never had that happen before with any of the macs (a lot) that I have reinstalled...

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