I have a wall switch that won't shut off the power. I changed it with a new one and still the power won't shut off. The box has 2 white wires inside and no ground. The new switch has 2 wire connection post and one post for a ground. I didn't hook up the ground because there is no ground in the box. This switch worked for 25 years but after changing it 2 times in the past few months, it won't shut off. Any ideas?

Does disconnecting the two wires from the switch shut off the power to the device the switch controls?