[mrlmd1]

Was it running, then you put it in first gear and let out the clutch with the sidestand up?, or did you let out the clutch with the bike in gear and the stand down, and then it died along with making a loud pop sound? Was that a backfire (gas exploding in the muffler) or some other noise?
The bike will not run if it is in gear if the sidestand is still down, but you probably know that.
Have you tried to start it since and you still have no power, no lights?
Like JWR said, check the main fuse and check your battery voltage. Hook up a set of jumper cables to another 12v battery and see if you have lights.
A blown fuse shouldn't really make a loud pop, that would have to be a pretty big short.