(OSX 10.5.8, PowerPC 1.25 GHz) Recently, the keyboard lighting stopped working and the preferences option has disappeared.  What happened?

(OSX 10.5.8, PowerPC 1.25 GHz) Recently, the keyboard lighting stopped working and the preferences option has disappeared.  What happened?

Reset the Power Management Unit (PMU): http://support.apple.com/kb/HT1431#faq10 . If that doesn't do it, reset PRAM: http://support.apple.com/kb/HT1379

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