no electricity

I am a newbe, new home owner 2 weeks:no:. I tried to take out a small night light in the light switch. I disconnected the two wires to the switch and saw a third wire, which seemed to be disconnected and not used for anything but after close inspection I noticed that this 3rd wire came out of...

I installed a dimmer switch for dining room light. At the switch plate it has two switches; one for the outdoor light and one for the aforementioned dining room. Did the usual; turn off all swithes at control panel to ensure I had the right one. But after installing and seeing the new...