Computer showing speakers as "Not plugged in", when they are plugged in?

Alright, so I've got a pair of Insignia speakers, don't know the model name. All of a sudden today, I boot up my PC, and no audio comes out. Go to check, and notice that the PC is telling me my speakers aren't plugged in. The light on the speaker is still on, so I know it's powered.

It's not plugged into a sound card, just on board sound. The driver is Realtek HD audio, and I've already updated the drivers, nothing. Any help?

The OS is Windows Vista Home Premium x64
 
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