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Well, first of all, a few simple things.
1) are you sure its plugged in? typically 4x's will have 2 power cords, one for each pair of lights.
2) where did you get it? some vendors are easy to work with and might help you out
3) if all else fails, open it up and just check that the wiring is securely run, attachment points are tight, etc. it may just be a loose connection to the second ballast
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