BIOS issues Dell Optiplex 790

Feb 6, 2019
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I have recently noticed my PC slowing down, so I updated the BIOS to the newest version A21. I was looking at the boot sequence in this BIOS and I selected uefi, and restarted my computer to see if that would make the boot faster and now it says "no boot device found". If I go back in the BIOS to try to select the legacy boot option it wont let me click on it.

Pc Specs:
i5 2400 3.10 ghz
gtx 1050ti 4gb
8gb ddr3 1333mhz
wdb 250gb ssd (boot drive)
wdb 350gb hdd
 


Its MT