Nikon D7000 Reset1Explanation: Pressing both buttons with a green dot next to them (zoom in button on the back and exposure compensation button on the top) at the same time will reset important camera settings to their default values.
You need to keep them pressed for about two seconds until the LCD display appears blank for a moment.

In the camera modes U1 and U2 the D7000 will reinstate default values that you have saved (see Modes U1 and U2) instead of the ones Nikon has predefined.

The impacted settings and Nikon‘s default values for them are:

setting default value
picture quality NORM
image size L
white balance automatic (AUTO1),
fine tuning neutral
ISO sensitivity AUTO and SCENE: automatic
other modes P, S, A, M, U1, U2: ISO 100
AF focus tracking automatic AF-A
AF focus point selection automatic
exception: some scene modes use single focus point or dynamic selection
AF (Live-View) AF-S
AF focus point selection
portrait AF
exception: some scene modes use wide-area AF or normal-area AF
exposure metering matrix
exposure lock off
Active D-Lighting (ADL) off
bracketing off
Picture Control the currently chosen picture control configuration stays active but will be reset to its initial values
flash exposure compensation off
exposure compensation off
FV lock off
flash synchronisation fill flash
exception: some scene modes use other setting
multiple exposure off
program shift off

Tips: You don‘t need this reset function if you use the recommended modes U1 and U2. Then a quick turn of the mode dial to another mode and back is enough.

In the other modes the reset is useful because it puts back all settings that are most frequently adjusted.