Occasionally after selecting Save Optimal Defaults in the BIOS Setup Utility, the system continues to reboot and perform BIOS POST, and does not load the operating system.
Workaround
Perform one of the following actions:
Press F8 during BIOS Post and select a boot disk, or:
Disable Late Sync.
Press F2 during BIOS POST to access the BIOS Setup Utility.
Navigate to the Boot tab.
Change the UEFICfg LateSync option to Disabled.
Save your changes and exit.
The system should boot normally after either of these actions.