Help...I am unable to access the BIOS for my MSI b350 gaming pro carbon motherboard. I was able to initially access it. Then when I was trying to load windows from a thumb drive unsuccessfully, all of a sudden I can not access the BIOS. I have rebooted and pressed the del key and it goes to the screen with "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key". This is my firs time building a pc.