My name is***** am sorry to hear that you are having this issue. I will be glad to assist you with this.
Try these steps please.
>plug in the power cable. Press the Shift+Control+Option keys at the left side of the keyboard and the Power button, and hold them all down for a few seconds. Release all four buttons at the same time, and then press the Power button to turn the Mac on.
Did that work?
Let me know if it doesn't and we can try another solution.