I had the keyboard backlighting issue described above and could not find any way to fix it. My hard drive failed and when it was replaced at the Apple Store the backlight started working again for no apparent reason. Maybe if you do a system restore and reinstall the factory software it might start working, I would think this was due to that rather than the Hard Drive. By the way, it was pretty dissappointing that the HD failed in 2 months, but I guess that's what happens when you put an iPod HD in a Mac.