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:
Pressure Plate Inspection and Removal
Remove the transmission.
Check the evenness of the height of the diaphragm spring fingers using
the clutch alignment disc (A), clutch alignment shaft (B), remover handle
(C ...
Exploded View
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"Honda_Special_Symbols";src:url(/sta ...
Accessory Power Socket Test/Replacement
NOTE: If the accessory power socket does not work, check the No. 13 (20 A) fuse
in the under-dash fuse/relay box and ground (G502) first.
Remove the dashboard center lower trim.
...