How many wires and what colors are they? Can you figure out if the hot one coming in is from the circuit breaker or one of the switches?

Did you disconnect the light or the switches, or all three?

Figure out which diagram applies to you and there ya go, typically involves knowing where the power source is.

power at switch http://www.buildmyowncabin.com/electrical/3-way-swtich-light-between2.gif

power at fixture http://www.buildmyowncabin.com/electrical/3-way-switch-power-into-light.gif

power at fixture between switches http://www.buildmyowncabin.com/electrical/3-way-switch-power-to-light.gif

power at switch with light between switches https://cdn-enterprise.discourse.org/smartthings/uploads/default/original/3X/2/2/22201760fb8e6a9d7a52d33582ed01e43ed1f12b.gif