I flipped off the breaker so that I could change out the 3 on/off switches in the bathroom that operate the light, the heat lamp, and the exhaust fan. The lights above the mirror in the other part of the same bathroom are on the same breaker. I changed one of the switches, flipped the breaker back on to confirm that it worked (it did), and noticed that the lights above the mirror would not come on. So those lights don't come on anymore even though all of the other electricals on that breaker work. Any thoughts?

 

It's obvious you didn't wire it up the same way as it was originally. Did you take a picture of the wiring before you started? Always a good idea. Take a couple of pictures of the wiring with it pulled from the box and identify as many of the wires as you can for us. http://www.doityourself.com/forum/el...your-post.html

 

Did the switch you replaced have wires both on the screws and in the holes in back? If so those were acting as splices and it is important the same two wires are spliced together when you install the new switch. The way the splice should have been done and the way you should have done it is connect both wires to a pigtail and the pigtail to the switch. If you do have one wire inserted in to the back of the new switch swap the wires on the screws. If it works then make a proper splice.

 

It sounds like the power from the panel comes in at the box where you changed out the switches, and that you left the hot feeder for the vanity lights disconnected. Look for a black wire that's been left out, or is not well connected.

If you worked on the neutrals, make sure all of those are connected together too.