So... I got a P55A-UD3 mobo with a Intel i5-750 CPU, 4GB of OCZ ram 1066MHz DDR3 (yea know slow but for $60 CDN after rebate couldn't go wrong), and I am unable to load any Operating System on the system when RAID or AHCI are enabled. Here are the specs: Gigabyte P55A-UD3 /w F6 bios version Intel i5-750 /w Noctua NH-U12P SE2 OCZ 4GB 1066 MHz DDR3 Ram Pioneer DVR-216D Sata 2x Seagate 500GB ST3500418AS Sapphire HD5850 PCI-E GFX card PC Power & Cooling Silencer 750W I am able to load Windows 7 Pro 64 to the point of formatting the HD's, then when I try to format, it says "Setup was unable to create a new system partition or locate an existing system partition. See the Setup log files for more information." Any idea's? I am going to try changing up RAM, and I have tried to load the OS from a USB flash drive and I get the same error. Any advice would be awesome.