The key combination varies from controller to controller, I was just giving you an example but it should tell you in your motherboard manual exactly what it is and also it should flash up while booting. Have you enabled Raid in your bios? For mine it was enabled by default but it might not be for all. Another thought, you do have Raid capabilities listed for the motherboard? Not all support Raid, it is rare now but there are still a couple which don't support it.