https://pcpartpicker.com/list/PCc6mqYep. What is your system like? The system is telling you it can't detect your drive. You have ruled out a loose cable? Could be a dead drive, a dead BIOS battery reset your settings, or maybe a bad SATA port. Anything noteworthy happen before this started?
My HDD is not listed within my BIOS, and I have no other harddrives.Do you hear the hard drive spin up when you turn on the computer? Is it still listen in the BIOS as a boot device?
Probably is a lost cause.Is there any chance the files could be saved? Or is it instead a lost cause?