Join Date: Jul 2008
Location: Austin, TX
Bikes: Giant OCR2, Bridgestone RB-T, Bike-E, Vision R-40, Novara Safari
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Take the switch out of the equation by touching a coin or piece of metal between the back of the battery and the case.
Beyond that, take the LED assembly out and look for anything amiss. You could also try touching the + end of the battery to the appropriate place on the assembly, and run a wire between the back of the battery and the frame of the assembly (I have this light, but don't have it in front of me to remember what it looks like internally.)
Just narrow the problem down.
But really, the most likely problem is that you just knocked the assembly loose, and putting it back properly will fix it.