Suddenly no boot device

I'm having an issue with my HP all on one running Ubuntu.

Last night I was trying to format a cheap sd card, and I had an issue unmounting the partition to format it. I ended up doing a hard power off. Now my system can't find a boot drive.

I was able to load a live usb, and can confirm the drive is still working and my files are intact, but my BIOS refuses to boot into it, despite seeing it in the BIOS menu.

Am I cooked? What do I do? The drive still works (it's an all in one so it's not removable), I can still access files with a live usb, how can I make the system boot on its' own again?