last year i purchased a MSI KT4 Ultra and installed it, It never booted up eg no fans or lights would even turn on psu was changed didnt make a difference.
got a replacement MSI KT4 Ultra replacement tested by a computer technician (who was going to install it) found to have same problem as the first board. M/B putting out only 3.3V instead of around 5V.
third replacement board recieved an MSI KT4 Ultra FISR workd fine for 9 months then one day the system froze up required a reboot to start first time system froze. Froze up again and restarted it wouldn't boot at al, it beeped constantly on a blank screen like a bios problem. reset the cmos then no fans or lights would even turn on, completely dead again.
Purchased Asus A7N8X E-Deluxe DOA would not boot but fans and lights would turn on.
Replacement Asus A7N8X-E Deluxe finally working.