Check your fuse or circuit breaker box. To do this, open the cover and identify the circuit that is not working by the identification chart if the fuse or breaker is not marked. If you have a fuse panel, look through the window in the glass fuse. If you can not see inside the fuse, then it is blown. Replacing the fuse should fix the circuit. If you have circuit breakers, the handle should be in the center position if the breaker has been tripped. To reset it, push it to the off position then push it back on again. The circuit is now reset. Note: If the above does not correct the problem consult a licensed electrician.

No, 3 prong adapters assume that a ground is present when in most cases, it is not. Consult an electrician to install 3 prong grounded receptacles.

You should only do electrical work if you have the proper knowledge and training to do it safely and correctly. Electricity can be dangerous, so if you are not sure of your skill level, it is best to let a professional handle the work.