If the text "Turning on WiFi" is shown in the menu "Wireless and network", disconnect the power cable for 10 seconds and start the Maestro once more.
If the Maestro shows available networks start with typing the password once more. The keys in the display is quite small and its not uncommon to type something wrong. The password is shown in clear text when typing it in so double check before pressing "connect".
If the problem still persists try to delete the already saved network. Long press the network and select "Forget Network". Try again to select your desired network and retype the password.