I installed Windows 10 on a brand new SSD Crucial. But I checked that the SSD is running in IDE mode. I changed it in BIOS to AHCI but after restarting I got the message ' inaccessible_boot_device'. So I turned back to IDE and worked well. So after reading for a time I read that changing the registry and enabling AHCI it would work. But didn´t. I made the following changes: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStorV Changed item "Start" to 0. (it was still in '0') HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStorV\StartOverride Changed item "StartOverride" to 0. (changed from '3' to '0') HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci Changed item "Start" to 0. (it was still in '0') HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci\StartOverride Changed item "StartOverride" to 0. (changed from '3' to '0') After the changes I enabled AHCI in Bios and still the same message: ' inaccessible_boot_device'. What may be wrong?