Optiplex 390, Replace Motherboard, Not booting without F12

Dell Optiplex 390, replaced motherboard (after fail)

Running Windows 10, since replacement of MB, only way to boot into Windows is by pressing F12 and selecting 

SATA: WDC WD5000AAKX-753CA1 (This works fine but not normal)

When I select BIOS SETUP ...Legacy  is checked with SATA ..., Diskette Drive, USB Storage, CD/DVD/CD-RW all checked....Ive read online I should boot via UEFI

When I change to UEFI...Add Boot Option...get add boot option box

Boot option name BLANK

File System List: PciRoot(0x0)/Pci(0x1F,0x2)/Ata(Primary, Master, 0x0)/HD(1,MBR,0x6758

File name BLANK

Small square with dots to right ...

EFI Boot Selection 

File System: Only option is FS0

Files 

COMMAND.COM

DELLBIO.BIN

DELLRMK.Bin

OOBEDDONE.FLG

Not sure if helps? Specific instructions with fix would be greatly appreciated.

Thank you