I bought a replacement mother board when my MSI mb went out. I had to get a LGA1150 so I could reuse my i7 Intel processor and the RAM from the old board. The one I settled on is the ASUS Z87 Expert MB, which installed easy enough but will not recognize any SATA connections. I have tried multiple HDD's and DVD drives on differing ports on the MB, checking for answers with ASUS, here on Tom's Hardware and several others, Youtube, updated the BIOS since I saw an update that mentioned it corrected an issue with the BIOS recognizing SATA drives and I have not found anything that works. In the BIOS the only drives it recognizes are USB drives once they are connected to the rear. What I currently have is the Z87 Expert motherboard from ASUS, 32 GB of Ram (2x 8GB G-Skill1333 and 2x 8GB of Corsair 1333), Intel i7 processor, new corsair 850X power supply, and have tried several SATA HDD's that are functional including WD, Seagate, and more. As it sits, it has an error on the MB of A2 and a steady light on the MB where it says "Boot Device LED". When I boot it up it starts spinning up the fans and goes through about 3 seconds of post checks, then shuts back down for like 3 seconds, then starts back through the full set of post checks, which i also find weird. Then I get an on-screen error of "The current bios settings do not fully support the boot device. Click OK to enter the Bios setup. Go to Advanced > Boot> CSM Parameters, and adjust the CSM (Compatabilty Support Module) settings to enable the boot device. No setting changes have helped, I have reset all to default by using F5, and no change either. I bought this new/unopened from Amazon. Any assistance is greatly appreciated.