Wio Terminal not connecting and flashing green light

Hi all,

I am working on controlling a 12V PWM fan with an external power source and the Wio Terminal. After following certain tutorials, it came to a stage where the Wio terminal was turned off, there was a connection between the 12V source and the PWM pin on the Wio through the fan. Even though the Wio was off, I could see the green light flashing irregularly in the Arduino- I instantly disconnected the circuit.

Now when I try to connect the Wio terminal to my Arduino IDE (without any other circuit components), the green light on the board close to the USB port on the WIO is flashing at a constant frequency.
I suspect that it may be damaged, or is it otherwise? What does the green light flashing indicate?

Any input would be appreciated:)