Boat has always been well maintained by Sail and Ski in Austin and in dry shed storage every winter. Boat sat 1 1/2 years during COVID and my wife's surgery. Batteries were on tender and started right up (on charger) when in the shed. Took it to the lake and it was dead as a hammer. Bilge pump worked, nothing else. Entered code and pressed start...nothing. Only single blue LED responded to keypad and screen never fired up. Replaced both batteries with new AGM Marine batteries. Nothing! Help!