[Solved] AHCI bios not installed

Last few days i am facing this error while booting my PC which is dell optiplex 755 with Windows 7 on it, i have searched on google and found few things which helps me in understanding "why this error occurs and where i change its setting its will show some response".

In the start i think its due to Hard Drive, i changed it with same specs and windows disk but nothing i got, after that i tried to change its data cable, again nothing happens, after that i decide to play with its BIOS than i moved in bios section every time after change by Pressing F2.

Things i have tried while facing this "AHCI bios not installed" Error.

• Changed Hard Drive.
• Changed Data Cable.
• Remove/Changed RAM's.
• Remove/Changed Cell.
• Changed BIOS Settings [Worked].

This time 1st i change BIOS time and data, than i change its SATA settings and in last i moved to my windows without any installation.

 Step 1:

For AHCI bios not installed Error Removal First Change your Date and Time

 2nd Step:

For AHCI bios not installed Error change its SATA Operation Setting to Legacy

Here you can a video in which i have showed the changes that i have made while trying to pass "AHCI bios not installed" this error on my "dell optiplex 755" with Microsoft windows 7 Pro.