No backlight when Leopard installer loads on MacBook Pro

The installation process starts. As soon as the language selector pops up, the backlight on the display turns off. The display is still on, I can barely see what's on it if it's on the middle of the day and sunny weather, or if I use a flashlight and point it on the monitor.
If I connect an external monitor, the backlight briefly turns on to 100% (just a short flash of light), and then turns off again. Same thing happens if I disconnect the monitor.
I've tried everything mentioned in this thread - http://forums.macrumors.com/showthread.php?t=375949. There seems to be some confusion in that thread. Some people talk about what I'm talking about -- installation -- while others discuss the backlights operation during normal operation, not installation.
It does not matter if I start from clicking the install icon in os x, or by holding down C while booting.
Any information at all on the subject would be greatly appreciated. When searching for "backlight" here on apple.com, most of the posts mentions the keyboard backlights. Perhaps "backlight" isn't the right term to google when I'm looking for issues with the display illumination?

I have the same problem. Resetting the pram fixed it for me. hold down command-option-p-r immediately after turning the machine on. Keep holding those 4 keys down until you hear the start up chime twice.
hope this helps

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