Well, I looked over the mobo specs and do not see any special features (like added controllers) which would usurp the boot order ... so ... somewhere in the BIOS is a boot-order selection field. If you (do you?) see your drive has been properly sensed and identified, that is a good sign.
It is important to "SAVE SETTINGS" before/upon exiting the BIOS screen (after any config changes).
Physically, you can try plugging your HDD into each of all the mobo SATA headers and go into setup ... ID it, Save settings + exit and re-start.
If you DID have another (known good) SATA HDD then, you could also try that one on all various SATA headers (also).
Finally, *DO* read this "The Oracle" of new build TS ... and HEED it exactly !