Hello tech guys! I just finished assembling my gaming rig, using the above motherboard, E6750, Ultra 500watt PSU, Corsair 2X1Gb and 80Gb IDE Hitachi, Samsung DVD burner, Ultra Mid-ATX tower, 2 thermaltake fans. After everything assembled, it won't turn on. First thought, was motherboard. So return and get a replacement from Newegg, still does not work. So second guess is the Ultra PSU, so Ultra send me a replacement and still won't power up. I had built 2 PCs before and never had a problem like this. Any idea what would be wrong with my PC? I tested the PSU with my other PC and it works fine so my only guess is the motherboard or the casing but I really can't believe if the motherboard is the culprit since I already had a second replacement. Any help or suggestions to trouble shoot my mobo would be appreciated. Based on Newegg reviews, some people had problems with this mobo... Thanks!