Do you have a multi-meter? This is a very good instrument to use to track down electrical issues; like yours. I would start checking at each electrical outlet. I would also see if there are any fuse that have failed and/or circuit breakers that have trip in the fuse panel.
I would also check the battery connections next door in the battery compartment something may have shorted out there also.
Here is an instructional manual if you do not have one and do not know how to use one, if you do sorry that I posted this link.
How to Use a Multimeter (with Pictures) - wikiHow