Clear cmos. Load defaults in bios. Up vdimm to specs.
Use AHCI if you're reinstalling Windows. Try enabling RAID even if you don't have a RAID setup. I use RAID or none of my harddisks will show up in bios. I don't raid the disks.
Also, on my X38, there's a new selection for dvd drive. It's NOT CDROM/DVDROM. The bios copies part of my dvd writer model to read like P4-LG-DVD-BLAHBLAHBLAH. So if you set boot order to CD, it may not boot the dvd drive at all.