@ljalvarez ,Luis, Mode dial problems, If camera still under warranty and for info. on your issue you may want to contact Nikon at the link below. Also find your manual pdf. below for trouble shooting and setup instruction. If manual sheds no light on your problem and out of warranty take camera into a good camera repair shop for a diagnoses and estimate on repair. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://www.nikonusa.com/en/service-and-support/service-and-repair.page
http://cdn-10.nikon-cdn.com/pdf/manuals/coolpix/P510_EN.pdf