Headphone and Microphone Jack won't Work Together

I have a headset set with a mic. It has 3.5mm plugs for the mic and the speakers. Just recently they stopped working together. What I mean is if I have either one of them plugged in, that one works. If I have both plugged in, the sound manager appears as if neither of them are plugged in. I've tried other headphones with the jacks and get the same result. I've tried reinstalling the driver, doing a system restore and using CCleaner to clean my registry. I've also messed around with just about every setting in the audio manager. Anyone have any ideas? It's odd that they work independently, which leads me to believe that the insertion detection is working just fine.

I have a Toshiba Satellite R845-S95 with Windows 7.
 
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