well, did u plug the PSU in properly to the Mobo? anyways this properly wont help but still, try troubleshooting your system.. take out your video card, ram except for the first bar, thats if u had more than 1 bar of ram, and everything else except a HDD.. now make sure the power is connected and turn it on.. if theres no power, PSU is dead.. but if it powers up and you get beeps, that will identify that the bios cannot detect graphics card.. now if ur getting success, what u then do is go through everything step by step.. add another stick of ram and turn it on again.. if that still works add the other stick(if u had more), then your CD drive, then graphics card.. its a step by step process.. never add more than one item per boot.. then say if it doesnt boot, then u know , that last item u added, maybe the problem.. hope that may help you or others troubleshooting..