Hi
I think you might have missed something in the middle. My friend experienced a similar problem a couple of years back with his MSI but now I am not able to recollect the exact solution for this. Maybe the BIOS update might be corrupted. There is a possibility that the BIOS update got corrupted in the middle without you knowing and the system might have restarted with it, leaving you with a blank screen. Try recovering the BIOS update from the motherboard. You can re-install the older version to check whether everything is running smooth.