Very strange boot problems... installed on HDD... but can't boot?

I have no clue what is going on

I set my HDD to boot priority 1 and took out the USB boot stick and it won’t boot at all now; it just asks me to insert a proper boot device and restart. I can see Ubuntu MATE system files on my HDD, I can even see the programs I installed while it was running

I formatted my HDD when I installed it so that’s the only stuff on the drive. Do I need to specify a boot file location in BIOS in order to boot from the hard drive?

64bit architecture, the HDD install went perfectly smoothly.

UPDATE: I did a TRY boot from the USB again, here is what the Disk app says about my drives:

500 GB Hard Disk

Referred to as the /dev/sda device (partition 1 is dev/sda1 etc)

Partitioning: GUID Partition Table

  • It is partitiioned into 3 partitions and has 1.1mb of free space

Partition 1 (537 mb FAT 32bit - Not Mounted): Partition Type = EFI System

Partition 2 (495 GB Ext4 v1.0 - Not Mounted ): Partition Type = Linux Filesystem

Partition 3 (4.2 GB Swap v1 - Active): Partition Type = Linux Swap

32 GB Drive (USB)

Partitioning: Master Boot Record

Referred to as device /dev/sdb , has 47mb of free space

Partition 1 (32 GB FAT 32bit - Mounted at /cdrom): Partition Type = W95 FAT32 (LBA) (Bootable)

Some BIOS segment drives by partition.
On my BRIX, I need to go to the BIOS boot options, and there I’m presented with multiple options for the only disk the machine as, something like:

P0: Samsung
P1: Ubuntu

Can you go back to your boot settings in the BIOS and check it out?

I found that boot option and can boot into ubuntu on HDD now but i have a new problem with my sda2 partition i made a new thread for it. Thani you

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