So I've been through three different Motherboards (Two GA-Z77X-UD4H, One GA-Z77X-UD3H) and I continue to experience boot issues. Fact is, the first two motherboards failed to get past the initial spin-up. The UD3H took a couple power cycles to get going, then ran like a champ for more than 12-hours of flawless installation and data transfer. I woke up this morning to power it on for a final run-through before work tomorrow, and nothing. After about twenty attempts to power cycle I got it running for a minute and so updated the BIOS. Wrong... now the board won't even flicker... I've built over a hundred custom Windows PCs and a few test Hackintoshes... Never had this much trouble.