Resetting the D3100
The D3100 does not have a 2 button reset option. To perform a reset you need to manually choose the reset option in the Shooting Menu and the Setup menu. To do this press 'Menu', select the Shooting Menu and scroll through the options until 'Reset Shooting Options' is highlighted, press ok, highlight 'Yes' and press ok again. Repeat this for the Setup menu.
Thanks for the info Don. I thought this two buttons reset thing was pretty standard on all models.