Hi JemTheWire. If you have cloned your HDD to an SSD then you would encounter a problem.
If you have a windows installation without AHCI enabled, then a registry fix is required.
To resolve this issue, enable the AHCI driver in the registry before you change the SATA mode of the boot drive. To do this, follow these steps:
Exit all Windows-based programs.
Click Start, type regedit in the Start Search box, and then press ENTER.
If you receive the User Account Control dialog box, click Continue.
Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE-System-CurrentControlSet-Services-msahci
In the right pane, right-click Start in the Name column, and then click Modify.
In the Value data box, type 0, and then click OK.
On the File menu, click Exit to close Registry Editor.
After this you’ll have to restart your computer, go to BIOS and enable AHCI. When you log in to Windows again, you’ll notice the installation of drivers for AHCI. Another restart will be required to finish the driver installation.
Have you checked in Bios that AHCI mode is enabled, once enabled, restart, enter Bios again and configured correctly?.
Also check boot priority to boot from SSD.
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