This is probably a really dumb question... but iMacs are a complete mystery to me, and since they are different from what I am used to, they obviously can't be any good.

I purchased for SWMBO a pretty nice USB headset (w/microphone) for her 24" iMac. She previously used headphones that weren't USB, that plugged into the microphone and headphone jacks in the back of the computer.

Now, of course, with the old headphones disconnected, the audio plays through the internal speakers. What do I do to convince the iMac to play audio through the USB headset?

tanstaafl.