Hard drive not recognized by system, Check physical connections, then check BIOS detection, "Bootable device not found", F12 boot menu or BIOS, Boot Record Corruption, Boot to recovery and run bootrec commands, "BOOTMGR is missing", Windows Recovery Console, Incorrect boot order in BIOS, PXE = network boot (used for imaging), Reconfigure boot order in BIOS/UEFI, BIOS/UEFI settings, Slow Boot, Defragmentation utility, S.M.A.R.T. error during boot, Backup immediately before any repair, SATA power cable not connected, POST can complete without drive power.

(A+ Core 1) Boot & Startup Troubleshooting

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