Start the computer and press F2 until the BIOS appears. Navigate the menu and reset it to it’s defaults. After doing that, double check that the boot mode is set to UEFI and not Legacy. Also make sure that the HDD operating mode is set to AHCI. A lot of times I see that it’s changed to RAID and people don’t realize.
Also check the physical connection, make sure the hard drive didn’t get knocked loose.
If none of those work, I would test your hard drive as it’s likely failed.