How to set SATA configuration to AHCI

I have just finished migrating my win7 o/s to a new SSD.
Everything works fine. No problem booting up.

As a next step I wished to enable AHCI. First I check the two registry entries as described in this tutorial
https://www.sevenforums.com/tutorials/61869-ahci-enable-windows-7-vista.html
(page 1) and ensured that both Start entries were 0.

Rebooted and entered BIOS setup program.
Changed the SATA configuration to AHCI.
Checked the Boot order next. It absolutely refused the option to select the SSD (with O/S) as the first boot drive. In fact it does not display that drive anywhere in the boot list.
Only when I go back and change SATA configuration to IDE can I then select the proper boot drive.

Bottom line, no AHCI

Any suggestions?

PS I had first posted this question in the tutorial thread cited above; that is an older thread and got no response. Therefore please forgive this double posting.

Which SATA port is the SSD connect to?

pbcopter said:

Which SATA port is the SSD connect to?

According to BIOS, SATA 2

Please post back a screenshot of Disk Management - Post a Screen Capture Image

What is the BIOS Boot Priority order now, as you didn't say?

The boot priority now is the SSD (C:\ system files), otherwise I couldn't boot or be on-line.

Disk Management:

Have you tried plugging the SSD into SATA1?

gregrocker said:

Have you tried plugging the SSD into SATA1?

No, haven't tried that. What makes you think it will make a difference?

No, haven't tried that. What makes you think it will make a difference?

Sometimes when things don't work as expected it helps to get back to basics. I've noticed with my builds that it works best for the BIOS to see the HDD/SSD on the first connection [SATA 1] for booting then add other drives to ports 2 through 4, 6 or 8. Sometimes the Optical drive has to be on SATA port 2. Check the motherboard manual as some SATA ports are colored different from others, usually a reason for that.

Have tried the various suggestions, so far no luck.
Any other ideas?