Have you taken the bulb out...and looked to see if it is not DEAD? As if in the little arc-tube is not cracked...? or shattered? That OFTEN happens with these Xenon-mercury vapor bulbs...they often crack the arc-tube.
If you can look and see if the arc-tube is trying to fire...a clicking noise from it means the ballast is trying to start it...but the bulb is dead..
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