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System setup, Boot menu, Boot menu enhancements | Dell OptiPlex 390 (Mid 2011) User Manual | Page 55 / 90
STEP 3: Recommended BIOS Settings: I don't have "Optimized Defaults" nor do I have AHCI mode | tonymacx86.com
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Question - Unable to startup windows 10 without pressing F12 and picking my hard drive | Tom's Hardware Forum
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System Setup; Boot Menu; Boot Menu Enhancements - Dell OptiPlex 390 Owner's Manual [Page 55] | ManualsLib
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