Question The ol' "No Bootlable Devices Found" Error

[no_boot_found]

I've played around with what have been at least a couple dozen different setting arrangements last night, and to no avail as of yet. I'm not an expert at this stuff; I tend to only address BIOS and related settings when an issue like this pops up.

The SAMSUNG SSD is the primary boot, with the ADATA acting as additional storage space.

Here are the specs:

These are pictures of the most recent settings I have it at:

 

[USAFRet]

A little backstory on this, please.

All the parts involved?
What was the last thing you did before it started doing this?