Check and reset all the GFCIs in the house, and specifically check bathrooms, other outlets in the garage, and any outdoor outlets. If you don't know what that is, it's an outlet with a couple of buttons on the front. One says "Test" and the other says "Reset". If it's tripped, the "Reset" button will be sticking out. Push it back in. To make sure, push the "Test" button and "Reset" will definitely pop out.
This sounds like nonsense, but it happened with me; the outdoor outlets stopped working and I couldn't figure out why. No thrown circuits, and everything else in the house appeared to work. A few weeks later I randomly noticed that the outlet in the downstairs half-bath (GFCI) had been tripped, so I reset it. Suddenly the outdoor outlets were working again. The cheapskate builder managed to save a few dollars by buying a single GFCI and running all protected downstairs outlets through it.
Also, sometimes a breaker will electrically trip but the switch won't flop all the way over. Run your finger down the row of switches with very light pressure trying to flip them open. If one is already electrically tripped the pressure should pop the switch the rest of the way. You can reset it, but it would be best to replace it.