Your motherboard indeed does have a CMOS button (to clear CMOS) . I would try clearing the CMOS. Turn the computer off. Remove the power plug. Open your case and locate the CMOS button. Hold it in for 10 seconds. Try and reboot.
Tried it. Splash screen confirmed CMOS was cleared. I hit F1 to continue but I still got Reboot and Select proper boot device or Insert Boot Media in selected boot device and press a key
â€‹Well, looks like your MBR has problems from the above post...follow my last instructions.
Are you referring to these:
I tried those and got
FixMbr: The operation completed successfully.
FixBoot: Element not found.
ScanOs: Identified 1 Windows installation. C drive, which is good since that's where it should be. The operation completed successfully.
RebuildBcd: Successfully scanned. Identified 1 Windows install. Typed Y add installation to boot list. Returned "Element not found."
Rebooted and still got "Reboot and Select proper boot device....."