INACCESSIBLE_BOOT_DEVICE

Possible solutions

Choose the method that matches your situation. Start with the simplest suitable option and check the result. If the problem is fixed, you do not need to continue with the other methods.

1. Reverting to the previous storage mode

   If you changed AHCI/RAID/VMD before the error, just revert to the previously used setting.

   Steps to follow

   1. Apply only if the error appeared immediately after changing your AHCI, RAID or VMD; if you haven't changed anything, don't use this method.
   2. Have a copy of data and BitLocker recovery key. According to the model manual, open BIOS, often pressing F2 or Del during startup, but the button may be different.
   3. Find exactly the storage mode option that was changed and revert to the known previous value. Do not touch other BIOS options.
   4. Save according to the command shown by BIOS and test the startup. Do not try consecutive modes without knowing the previous value.

2. Disk and boot diagnostics

   If the mode does not change, check the SSD detection; a disappearing disk needs a data save first.

   Steps to follow

   1. Save important files if your computer or drive is stable. If it makes unusual noises, smells like burning or the battery is swollen, stop testing.
   2. Write down the exact pattern of when the problem started and what action it took to reoccur. Take a picture of the visible error or deformation without opening the case.
   3. Submit a repair request with this information.