Wht is my hover board have a high pitched noise and then stop working?

My hover board after charging I turned it on and it suddenly had a high pitched noise every time the board was of and after riding for a couple seconds it stops working unexpectedly with the green light staying on and I wasn’t able to turn the board off till I unscrewed the half of the board with the power button and manually disconnected the cable leading to the battery. After re screwing in everything the noise continued but the hover board drove again and then the same thing happened so now I have repeteted what I did and I haven’t trying riding it again because of fear of the same stuff happening please help