Overnight, power went out for an overhead heat light and a powered air vent in two rooms on one side of the house, and way on the other side of the house, for an overhead heat light and a GFCI plug in one room; a combination light/powered vent and another GFCI plug in another room; and an attic light and powered vent fan. Also, a GFCI plug outside the house that powers a water softener. All circuit breakers are untripped, and I tested each one with a multimeter and all are putting out power. Every GFCI I mentioned is at the end of a run (no loads are wired onto them). I don't even know where to start with this problem, since the affected fixtures are not listed on the breaker box door (the description cells are all blank), and since there's no power to the affected fixtures, I can't isolate the problem by flipping breaker switches. I don't see how it could be related, but 12 hours before the power went out, I replaced a faulty GFCI in a bathroom, and it is working perfectly and a plug receptacle load downstream of it is also working. All wires coming from the breakers seem to be nice and tight. What can I do?

I'm looking to install a smart light switch (TP-Link HS-210), and I'm having a bit of troubles figuring out which wires are what on the old existing light switch. I couldn't get a decent picture, but attached a drawing I drew up on Paint... On the light switch I'm wanting to replace (left), there are two black wires going into the back of the switch, a black wire hooked up to the top screw terminal, and another black wire hooked up to the bottom screw terminal which then goes off into the back of another light switch. That other light switch which I'm not replacing has a black wire going into the top screw terminal, and a red wire to the bottom screw terminal. Hopefully either my wording or the drawing I drew made some sense...There's also white neutral wires in the electrical box not shown in the pic. When going through the step-by-step instructions to install the new light switch, it's asking for common or line/load wire, traveler wires, and ground wire, Anyone have any idea which wires are which? Thanks! [attach]99310[/attach]