Depending on the length of time the power was interrupted, your system may require GPS initialization.

If initialization is not necessary, the system proceeds directly to the Startup Confirmation screen.
If the system fails to locate a sufficient number of satellites to locate your position within 10 minutes, the following screen is displayed.

If you are experiencing GPS reception problems:
Editing My Destination
DEST button (when en route)
►My Destination
Delete or edit the order of waypoints.
1. Select Edit.
► Select Map to display the
destination and waypoints on
the map screen.
...
Update, Coverage, Map Errors
...
Brightness Control
When the parking lights are turned on and the
ignition switch is in ON , you can
use the
(select/reset) knob to adjust
instrument
panel brightness.
Brighten: Turn the knob to the right.
...