Hi. i just made this build. I bought these parts on tpu, [H], and on anandtech. Phenom 555 BE, ASRock 890Gx extreme 4, NZXT gamma, GSkill DDr3-1333 2x2GB RAM, caviar blue 250GB, hyper 212 (this I bought new), Antec truepower 550W. Haven't bought a vid card yet, though. The build powers up alright, but it does not show POST. Twice, I've managed to show POST, once when i switched out the phenom for an AM3 Sempron that my friend has, and once with the Phenom, but at that time, the W7 installation stalled, so i had to shut it down. I've used this guide that tom's hardware made for what to do when the build does not post. I've taken it apart and breadboarded it, put it ack in the case, tried with 1 stick, tried with another cpu/mobo/ram. the individual parts don't seem to be a problem, as the phenom with another mobo worked, the mobo with a sempron worked, and the RAM worked fine with another computer. What should i do?