My case broke my speakers

I was playing Far Cry 2 with my USB speakers (Logitec S-150) turned on, when I plugged some iPod headphones into one of the front audio ports of my Antec 902. Now my speakers dont work on my PC.
I have tried them on my laptop, and they work, same as always, but on my PC, they don't.
So somehow, plugging headphones into the case broke the speakers. Does anyone know why/what I can doto fix it?

I have tried: Different USB ports (all of them)
Restarting PC, twice

Try a system restore and see if that helps..

It would seem I was slightly hasty in posting this, not two minutes later, I found the solution.
Somehow, plugging in the headphones changed the default audio output the the headphone slot, by going into the control panel and changing this in 'Hardware and Sound', I solved the issue. But thank you for replying.

Glad you got it sorted out...