Screen backlight off during 10.5 install and after reboot?

Hi there,
I'm having an interesting issue with my MBP after Leopard installation. Interestingly, it started with the actual installation itself -- when I rebooted into the install process, the backlight on the display was off and I couldn't turn it on/make it brighter with the keyboard commands. I went ahead with the install, and the same problem now happens when I reboot the machine -- the backlight is off until the OS boots fully and I'm logged into my account, and then the keyboard works to brighten the screen.
Any ideas? I've searched the forums and haven't found anything helpful...
Thanks!

Hi there,
I'm having an interesting issue with my MBP after Leopard installation. Interestingly, it started with the actual installation itself -- when I rebooted into the install process, the backlight on the display was off and I couldn't turn it on/make it brighter with the keyboard commands. I went ahead with the install, and the same problem now happens when I reboot the machine -- the backlight is off until the OS boots fully and I'm logged into my account, and then the keyboard works to brighten the screen.
Any ideas? I've searched the forums and haven't found anything helpful...
Thanks!

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