Ok im stumped

[ocho]

I have puck lights that run on 12v. 6 of them in the living room. 2 at the top of the stairs. 2 separate switches. Only 2 of the 6 in the living room work. Ive checked the bulbs by taking a known operable bulb and plugged into a dead light. Doesnt work. So im thinking its either the fixture itself or the wiring. Are these wired in series or parallel? Can a fixture go bad? Help. Its getting dark in here!