just keep a temp checking application running in the background all the time mate (set it so that it starts up with windows and sits nice in your taskbar at bottom of screen), that way you are able to constantly monitor the temps, I personally use AIDA64 extreme edition (the latest edition), works a treat and I don't even see any impact it has at all on the system resources etc, still aint right though that the bios says "0" degrees, but as others have said and you have also updated the bios too I don't think you need to think or worry about it, why not email msi to see if they can help you directly if the board is under warranty, or if your still not happy with that and the board is under warranty you could always return it etc, up to you though.