Put together a Z77 Extreme 4 outside the box. Motherboard,CPU, Memory and monitor hooked up. It posts to the UEFI setup screen. Dr Debug shows code A6 (SCSI Detect). Since there are no drives hooked up is this normal or do I have a problem?
So you have no HDD or SSD's hooked up to it? If so it means its not dectecting anyone OS. I recommend hooking your main drive (which one has your OS on it) than boot it up again should fix it.
Problem related to IDE or SATA devices. Please re-install IDE and SATA devices. If the problem still exists, please clear CMOS and try removing all SATA devices.