I have just done a fresh Windows 7 Home Premium SP1 (build 7601) install on a new SSD. I am using my old HDD for storage in the same machine. The old OS has been removed.
I have specified the SSD in the BIOS as the first boot device and no other devices are specified. When I try to boot up I get a dos message saying:
No boot device available.
SATA 1: installed
SATA 2: installed
SATA 3: installed
SATA 4: none
1 is the old HDD; 2 is CD-rom drive; 3 is new SSD.
When I boot from the boot options menu and select the SSD, all is well. This, of course, is a one-off selection, which I have to do on every boot.
My BIOS (Dell A03 12/21/2009, latest version) setting is "ATA". I cannot see an AHCI option. When I installed Windows I saw no option to select AHCI. I have subsequently fixed this (?) by changing the registry setting "Start" under msahci in the HKEY_LOCAL_MACHINE area to 0 from 3. The above failure to boot occurs always regardless of this setting.
Obviously I'd like to be able to utilise AHCI and boot the computer from the drive selected in the BIOS.
The PC is a Dell XPS8000. Mother board is 0X231R A01.