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:
Valve Body and ATF Strainer Removal (A/T)
Remove the ATF feed pipe (A) from the regulator valve body (B).
Remove the ATF feed pipes (C) (D) from the servo body (E).
Remove the ATF strainer (F) (two bolts).
...
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. ...