I just formatted the 9100 system, used F6 to load AHCI to see the harddrive, after reinstall windows system goes into blue screen,so I have to set operation to something other than AHCI, then system works fine.

I even tried to force the AHCI driver to be installed in Device manager and set the system back to AHCI before reboot  to window, but it doesn't work.

Just want to know how I can put the system back to AHCI mode? I contacted Dell Tech support, they just gave me some very very basic instruction...( like download the driver and use F6 ) I think there is some glitch in the bios.

Can anyone help me please.