Lost sound on macbook pro

Hi Macfriends,
Running Macbook pro, 2.2 ghz, system 10.4.11. Latest updates installed. Had portable speakers plugged in (worked fine). After removing them i lost ability to adjust sound. I cannot move the slider bar (it is very light in color) and I can't grab it. Have played with sound preferences--it is not on mute...have tried restarting, disk utility says no problems. the slider bar is at top (loudest) but i can't grab it. The preference panel says "Digital Out----built in output". Am I missing something obvious.....Any thoughts? All help will be appreciated! THANKS!!! Joe

UPDATE----FIXED IT!
I plugged the speakers back in and the headphone showed up under output in sound preference panel. Plugged in and out couple times and "internal speakers" showed up. I selected it and wooo-la, it resolved itself! All is fine again in macland!!!!

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