Nikon D5000 - Flash not working?

I bought this camera well over a yr ago and haven't really used it as much. But now its flash isn't working. I have tried: auto mode and everything else. It pops up but does not work.
Does anyone know what the probelm could be?
Also, do you know how to restore the default factory settings?

Put new batterys init

Do you have an owner's manual? If you do check to see the flash is turned on. If you don't have a book go to the Nikon site to download a pdf version.

Congrats on breaking your camera flash