it is expected that u have the hard drive connected to the motherboard because that chip is predominately used for onboard RAID. You will only need to enter the BIOS and change the hard drive as well:
config from RAID to something like “IDE” (which means your SATA drives will act as normal IDE) meaning it will get detected by setup.
you need to enter your bios utility go to the advanced section, select onboard device configuration. select nvraid configuration(if so) Select the first option labeled “raid enabled” set it to disabled. Now restart the computer….
NOTE : But before doing anything must take backup of ur necessary data ! and be careful to handle BIOS.
Hope it helps u !