My xbox one S will not turn off, or connect to tv and the fan is over running and really loud

My xbox one S will not turn off, isn't connecting to the t.v. and the fan is over running and really loud I've tried holding down the power button to reset/turn off but nothing happens and I've unplugged from the mains but when I put the plug back in it
is exactly the same - the power light comes straight on and the fan really loud but nothing else. Please help.

:)