Hi Black Bear and Welcome to ROG
This may or may not fix your issue, as it very often depends on how you install windows, and I don't know how you have commenced your installation.
The issue with AHCI is it needs to be enabled in the BIOS prior to OS installation; doing so after you have installed the OS will disable the PC or cause your problem. The reason why, Windows disables the AHCI drivers not needed during installation.
If this is your situation, then this will show you how to enable AHCI after you have installed the OS if you didn't already have AHCI enabled in the BIOS when you installed the OS.
This method works for Windows 7 using the default DWORD string value in Windows 7. As as a precaution it would be a good idea to create a "System Restore Point" before you start this.
1. In the Windows Start menu search box type regedit, right click the entry, click Run as Administrator.
2. In regedit navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services.
3. In the left pane, click on msahci, in the right pane double click on Start to modify it.
4. In the window that opens change the value to 0 (zero), and click OK.
5. In the left pane, click on iaStorV (if there), in the right pane double click on Start to modify it as in step 4.
6. Close Registry Editor.
Restart the PC and go into the BIOS and enable AHCI. When Windows boots up, it will finish installing the AHCI drivers. You will need one final restart to finish the process after the drivers are installed.
Hope this helps and please report back.
MM
We owe our existence to the scum of the earth, Cyanobacteria
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