Hi Dark Sage. Failure to POST can be caused by any one of several things. I suggest thet you try stripping the computer down to the minimum configuration. Disconnect everything from the motherboard except the processor with it's heatsink, ATX power connector, power switch and case speaker. At power-up this should give an error beep because there is no graphics card or memory. You can then start adding components until you don't get any POST beep. The last computer I built had this problem and it was the graphics card that caused it.