Hi! I decided to upgrade my computer from S775 to some new stuff, but unfortunatly I'm running into major SATA problems. The mainboard doesn't recognize some of the below disk & DVD drives connected to S-ATA (At UEFI/BIOS level). I've individually tried all four of the drives with the following results: However, if I test the drives in pairs or three at a time, the results change, IE the 3TB drive wont work in SATA2 any longer. I've tried using many different SATA-cables. The DVD-Drive also gives a lot of errors in the event viewer and I can hardly access the drive at all in windows. Hardware used: Samsung SSD 830 Series 256GB 2.5" OEM Optiarc DVD-RW SATA1 (from around 2007) Western Digital Caviar Green WD30EZRX 3TB 5400rpm 64MB 3.5" SATA-3 0.5TB Samsung T166S HD501LJ ASUS Maximus V Gene Core i5-3570K Corsair 2x4GB DDR1333 LP OCZ ModXtream 500W MSI GTX 660 OC Any help would be appreciated, but I believe I have to RMA the board, unless the CPU could be responsible for this kind of behaviour (some parts of the controller is now integrated into the core, right?) ?