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:
HFL Menus
Use HFL when the vehicle’s ignition is in the ACCESSORY (I) or ON (II)
position.
You can operate HFL by voice when on the PHONE screen. Below is the flow chart
showing available voice commands ...
Instruments and Controls
This section gives information about the controls and displays that contribute
to the daily operation of your vehicle. All the essential controls are within easy
reach. ...
Inspection
Install the nut on the damper shaft end, and set the socket wrench and
T-handle on the nut.
Compress the damper assembly by hand, and check for smooth operation
through a full ...