Camera Movement has Ceased

[phrontist]

Okay, I have an interesting situation:

I hooked up the CMU cam a few days ago, powered up the bot, and it snapped to position as it should. I've since downloaded the camera code and had a teammate redo the assembly and it seems to have stopped driving the servo (essentially a few variables changed simultaneously, which is never a good situation to be in). My assembly is for up/down movement only (like the example mount) and the servo is connected to the pan port. No jumper settings have been altered. It does not snap to default when I power it up, nor does it resist if I try to gently move it. Any idea how to go about troubleshooting this?

Clarification: The power LED does come on.