Just noticed one of my head lights seem to be dead.

Recently got the car (2004 STI) which has Xenon's fitted. I have tried fiddling with the wires that go from the small box to the bulb and found that the bulb does flicker and can hear a sort of ticking noise?? when wiggling the cables.

I haven't had much time to look at is this eve but will take a further look tomorrow, is it ok to just swap the bulbs or boxes around to try and eliminate what is actually faulty?

Thanks