Are you at least able to read the temperature from the BIOS? The monitoring software gets the values from the bios and the bios in turn gets them from the board.
Try to check with the board Manufacturer if there is any new bios that can fix this. Is there any monitoring tool from the board manufacturer that you can use to test?
If yes, and it is still not working properly, contact Asus for further support. If it was an Intel board, i would have told to use Intel monitoring software and contact Intel Customer Support
** I dont trust third party software **
All the best,