HID bulb exploded in housing

[gubo]

On my '04 X5 with factory Xenon, the OEM driver's side HID lowbeam bulb went out, along with Check Lowbeam warning and fog lights turning on. I opened the housing and found the bulb had exploded (catastrophic failure). I cleaned the bits of broken glass out of the projector lens, and replaced the bulb with a new Sylvania OSRAM XENARC D2S HID. However, the HID headlamp still does not light after bulb replacement, but warning message went away. Angel eyes, fogs, and halogen are all working as usual.

What might have caused the bulb to explode? And if I assume the replacement bulb is not defective, what is suspected to cause it to remain inoperable?

Any insight is appreciated.