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STEP 3: Recommended BIOS Settings: I don't have "Optimized Defaults" nor do I have AHCI mode | tonymacx86.com
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OptiPlex 390 Small Form Factor Owner's Manual
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OptiPlex 390 Desktop Owner's Manual
File O390-A11.exe — Bios for Dell OptiPlex 390
File O390-A11.exe — Bios for Dell OptiPlex 390
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![SOLVED] UEFI Issues on Optiplex 390](https://static.spiceworks.com/shared/post/0021/8341/UEFI_BIOS_Boot_Select.png "SOLVED] UEFI Issues on Optiplex 390")