No Power in My Bathroom: GFCI Outlet
This is one of the most common calls I get as a Las Vegas handyman, and it really is difficult to get people to believe that they can solve this problem by themselves. Typically, all you need is your index finger.
There are safety features in your home's electrical system. If you have electrical outlets near wet locations (bathrooms, kitchen, garage, exterior of the house), you should have Ground Fault Protection.
A Ground Fault Circuit Interrupter (GFCI) is a safety tool that protects against electrical shock caused by a faulty plug, cord or appliance. It senses small changes in electrical current and can shut off the power faster than you can blink your eyes. But all kidding aside, a GFCI could save you from a potentially deadly shock.
The GFCI receptacle has two buttons in the middle to periodically test that it is functioning properly. One button is labeled "test" and the other is labeled "reset." When you press the test button, the power to that receptacle should shut off immediately. To restore the power, depress the reset button. The power to additional receptacles may also shut off if they are downstream of the GFCI, that is, if they receive their power from that particular GFCI. In this case, those additional outlets should be labeled "GFCI protected outlet," but this is not always the case.
So, the fix here is to reset the GFCI outlet by depressing the "reset" button. Realize that the GFCI outlet in question may not even be located in the bathroom, but rather in the garage, the kitchen, on an exterior wall, etc...so look around until you find it.
You may have GFCI protection even though you don't see a GFCI outlet. In your home's main electrical panel, there may be a GFCI circuit breaker. This breaker has a test switch on it to ensure that the outlets in the circuit are operating properly. If this is the case at your home, the circuit breaker will trip to a middle position. Just turn it off and then turn it back on.
You will have to figure out why the GFCI outlet tripped. You may want to unplug whatever you have plugged in to the circuit and then eliminate possible sources.