Hi Mari,

There's no single answer to your question that covers all the possibilities.

The power windows are made up of several parts, any of which can fail and cause the window to not operate. You've got the window switch, the wiring going from the switch to the motor and the power wires going from the fuse box to the switch, the motor itself and finally the regulator, or mechanical parts that physically move the window up and down.

I would probably start with the motor. You'll have to remove the door panel then, with the key turned on (doesn't need to be started), check the connector that plugs into the motor for power using either a voltmeter or a 12V test light.

If you have power to the motor, you'll need to check for the motor itself being faulty or the window regulator being broken or frozen.

If there's no power at the connector, you'll need to trace the wiring back to the switch and determine if you're getting power to the switch or not.

That's a good place to begin; check that and let us know what you find; then we can figure out what your next steps should be.