Sound from external speakers, but not from internal speakers

I tried searching as much as I could and couldn't find an answer....
I always use my function keys to turn my volume up and down. It has worked fine until today, then all of a sudden, my internal speakers wont turn up or down when I use my function keys. The volume window comes up and below the volume level bar there is a circle with a line through it (like no smoking sign, but without the cigarette)which I guess leaves my internal speakers on mute.
So i came home, and plug in my logitech speakers, and I can control the volume fine from my function keys. Then I disconnect my logitech speakers from my computer and I get the same problem with my internal speakers.
I probably confused everyone but I guess a short version is my function keys wont turn on my internal speakers, and when I have external speakers plugged in, everything is normal.
Please help.
Thanks,
Brendan
Black 13" Macbook 2ghz Core 2 Duo 2GB   Mac OS X (10.4.8)  

If you look in the headphone jack, can you see a glowing red light? This happened to many people, it was an issue where a switch got tripped to make the computer to think that a pair of headphones or external speakers were plugged in. Try inserting a toothpick inside the headphone jack and gently probing around in there to try and turn off the switch.
See here.
And by the way, you don't need to bump topics that are only three hours old.
Message was edited by: aqua*star

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