It seems that this computer is configured to boot via EFI, but maybe that configuration will not work for booting from the hard drive. Some EFI firmware implementations do not meet the EFI specification (i.e. they are buggy!) and do not support proper configuration of boot options from system hard drives.
Yettban uselkim-a yettuswel i wakken ad yekker s EFI, maca ahat tawila-a ur tetteddu ara i usenkar seg yibenk aqquran. Kra seg yisebdaden n ufreɣẓan EFI ur d-ttarrant ara i ilugan n EFI (anamek-is ttwabugin!) Yerna ur sefraken ara tawila tameɣtut n textiṛiyin n usenker seg yinuḍaf iqquranen n unagraw.