Sleep indicator light not working

This isn't really that huge of an issue, but I've noticed that the sleep indicator light on my 366MHz Firewire iBook, which I recently bought on eBay and installed a few upgrades in, seems to not be flashing when the computer is asleep. At first I suspected a bad LED, so I swapped it out with a known-good indicator light from my previous 300MHz iBook. That hasn't seemed to work, and both display cables going into the motherboard appear to be securely attached. Oddly enough, I do recall one time when I put the computer to sleep and the indicator light worked (this was somewhere in the middle of my trying to get it to work), but I haven't been able to replicate it.

Have you tried to reset the Power Management Unit (PMU)?
http://support.apple.com/kb/HT1431?viewlocale=en_US

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