No LCD Backlight when trying to install new OS

[Parker]

On a MacBook Pro 1st Generation
currently running Tiger
I tried to update the OS to Leopard 10.5 and when I boot to the install disc, the LCD backlight does not work, and I can not read the screen or adjust the backlight (the screen is only readable when it is lit by an outside light)

How do I fix this problem?
Does this mean I can not install a new OS because the screen backlight won't work, or if i went ahead with the install would the computer function normally?

[Paddy]

You are not alone, apparently...

http://discussions.apple.com/thread.jspa?m...93772�

http://discussions.apple.com/thread.jspa?m...30�

If all else fails, it looks like the solution is a powerful flashlight until the install is finished - at which point things return to normal. Very weird. Of course, I'd try the PRAM and PMU resets too, in case they work.