Electrical Wiring Lighting Circuit Breaker – No Power at Light Fixture

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enter image description hereI am installing a new vanity light fixture, but after installation it did not turn on. I reinstalled the old one and now that one doesn't turn on either at that fixture. So I used a multi-meter on the wires and it does not detect any AC voltage – I've checked the breaker and it has not tripped. I am out of ideas of where else or what else to check.
Any ideas?

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Best Answer

As it turned out, it was the dimmer which must have been shorted by the new light fixture. While the light fixture is dimmer compatible, I guess the old dimmer wasn't up to the task - and was probably why there was no power getting to the light fixture. bought and installed a new dimmer and now it works!