Number lock key (F6) won't unlock

I don't remember pressing this key down, but it is locked and the green light is on...and I can't unlock it no matter how many times I push it or hold it down. So, the keyboard will only type numbers right now
I tried rebooting, but it didn't reset.
I also tried going to preferences and resetting the keyboard to default, but that didn't work either.
This is basically the first problem I've had with the computer in 3.5 years.
Any suggestions on how to 'unlock' the number lock?

Hi, Rachel, and welcome to Apple Discussions.
A Num Lock light that stays lit is sometimes a symptom of a deeper problem. Try resetting your Powerbook's Power Management Unit. Does that help? If not, run the Apple Hardware Test from your Powerbook's original Install & Restore DVD, and let us know what AHT reports.

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