F1, F2, F3 and F4 keys are no longer responding, what did I do?

[callliope]

So here I was, happily using my macbook that I've had for 3 years now with nary a problem, and everything was working as normal. Then it's possible that I hit some combination of keys unintentionally in trying to hit Command+T to open a new tab? I'm not sure. But the next time I went to hit F3 to use the Expose function, it didn't respond. Neither did F4 to open dashboard, and same with F1 and F2. Did I do something? Did they just spontaneously stop working? Am I missing something obvious?

Thank you for any help you can offer!
-Rachel

 

[GGJstudios]

System Preferences:

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[callliope]

Hmm, I just checked that, doesn't seem to be the answer... any other thoughts?

 

[Nermal]

Hmm, I just checked that, doesn't seem to be the answer... any other thoughts?

It needs to be unticked if you want Expose etc.

 

[callliope]

Yeah, I did that, and it had already been unchecked. They're still not working even with that unchecked.

 

[callliope]

Oh, ha! Yeah, in the first post when I said I checked that, I meant that I looked at it and verified that it was unchecked!

 

[Nermal]

Ahh, the joys of English