Is it the Bulb or the Ballast?
Whether you have a HID / Xenon kit or a factory fitted xenons at times the bulbs stop working, there are a few simple steps you can take to determine whether its the ballast or the bulbs.
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Check the fuse!
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Transfer the bulb from the side that is working to the side that is not working - if the bulb fails to work then the problem this points to the ballast. Change your ballast or install a bypass kit.
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Transfer the ballast from the side where the bulb is working to the side that is not working - if the bulb on the non working side now works this points to a faulty ballast.