Lighting, Light Fixtures, Ceiling and Exhaust Fans - track light problem

Hi, I have a problem with a track lights and hopefully someone can help me.
It has 5 lights and all of sudden they all stopped lighting. I changed a switch box which has 2 switchs - one for the track lights, and the other ceiling lamp, only the track lights does not work- with the same result.
I checked a voltage with a non contact voltage tester and the whole tracks and the lights have voltage whether the switch is on or off, but no lights.
In the switch box, there is 2 whites and 2 blacks, I assume one for each switches. Only 3 of the wires have voltage, and I have no idea what that means.
Help..

So you pulled the switches and don't remember where the wires go, right? Do either of the white wires have black tape on them? Are the lights controlled by another set of switches in another location as well? If you have access to a voltage meter, check the voltage from each wire to the bare wire and note the voltage of each. If one reads 48 volts, you have "phantom" voltage, which will be detected by a tic tracer, but is not considered "line" voltage.
Shoot back some answers, and let us take another stab at it.