Andanas

If the lights on the board aren't even coming on despite everything else working, its gotta be the board. My suggestion is, if the board is under warranty get it replaced. If its not, go with an ASUS or Gigabyte board. I like MSI and all, but they have a lot of people that complain about their boards being DOA or dying on them after a short time, under normal use.

It is under warranty,  but this would be the second time I'd be replacing it (first time was for a CPU  socket issue),  so I'm a bit apprehensive about going through that process again.   I may just get a new board,  either ASUS  or Gigabyte, as you suggested. 

I suggest to RMA it since this clearly is an temperature sensors fault.

Your CPU temperature sensor seems faulty. Intel CPU's have temperature sensor on CPU not MB.