I was replacing a wall switch for a magnetic low voltage, recessed
halogen lighting fixture. The switch wasn't properly protected and it
shorted out when the live wire screw accidently touched the junction
box. I reset the circuit breaker, but now the fixture doesn't work.
I've tried replacing the bulb (MR-16), tried replacing the dimmer
(Lutron MALV), and even tried putting the original switch back in, but
nothing works. I also tried turning off all circuit breakers to reset
the system, again no change. Other lights on this circuit breaker work
fine.  It doesn't seem to make sense that the circuit breaker tripped,
but the fixture breaks.

My question: Do you think the fixture is broken, and is there a way to
troubleshoot without ripping open the ceiling to get access to the
fixture and magnetic transformer? Is there anything else I can do to
try to get the fixture back on?