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:
Safe Driving
...
Clock Adjustment
INFO button
► Setup ►Other
►Clock Adjustment►Clock Adjustment
Set the automatic adjustment of the system clock for daylight saving and
international time zones.
Select ...
Replacement (Part -1)
Remove some of the brake fluid from the master cylinder.
Raise and support the vehicle.
Remove the front wheels.
Remove the brake hose mounting bolt (A).
...