whoops, if thats the case, then my mistake...
Considering I had that EXACT same issue before though (granted, on a different m/b), no POST, or any beeps for that matter, no image, fans and components seem to work... and it was due to the 4 pin power connector... if its plugged in, the issue could be with the PSU on that 4-pin or the "input" on motherboard... try unplugging the 4-pin connector and see if you experience the exact same issue... (its not not guaranteed to be the issue if you do, but it makes the probability of that being the issue higher ^^)