Re: Fenix L1D-CE is dead!?
I'd try tightening the switch retaining ring. I received mine on Monday, and playing with it the ring loosened up to the point that the switch was working intermittently.
Tutorial:
1) Remove the tailcap as if you're going to install a battery.
2) Look inside the tailcap. You will see a spring in the center, surrounded by a silver-colored ring. The ring has two holes or dimples in it. These are what you use to tighten it.
3) Find something that can fit into the holes. I have some small Asian scissors used for gardening that work well. My wife has some jewelry pliers that come to points that work better. Anything like that should work.
4) Put your improvised tool into both holes, and twist - tightening the ring. The ring should probably be pretty tight.
Hopefully this works.
If there's friction on the ring (which there always is because the contact between the ring and the body of the light is necessary for it to work) and the ring's not tight enough to overcome the friction, it will loosen up. This can happen to the point where the switch isn't properly making contact.
Let us know how it goes.
EDIT: I forgot your other issue - I have a circle on the contact in the head of the light also. I think it's normal, and I seriously doubt if it's the cause of your problem.