It is likely your Controller has a low charge. We recommend plugging your RV into shore power, setting the battery disconnect switch to ON, and letting the Controller charge. Most often the Controller will fully boot up after 4 hours of charging time. If the Controller has been without power for an unknown or extended period of time, it may take 24-48 hours before the Controller fully boots.
If the Controller has been allowed the proper amount of charging time but still does not power on, it will need to be replaced.
NOTE: We never recommend attempting to charge the Controller tablet using a wall charger. Removing the Controller tablet from housing will likely damage charging connections and the keypad that is required for pairing.
In the meantime, you can download the BMPRO RVMaster app onto your smartphone, so you can continue to control your RV no matter what the Controller is doing.