Intel Core i7-3930K Corsair H80 2x 4x4GB (32GB) G.Skill Ripjaws Z DDR3-1600 C9 ASUS Rampage IV Extreme Palit GTX 560Ti Twinlight Turbo 1024MB GDDR5 Kingston HyperX 120GB SSD ASUS XONAR DX LG DVDRW LG DVDROM Seagate Barracuda 3TB (ST3000DM001) Western Digital 6401AALS Western Digital 2TB FAEX ThermalTake Level 10 GT Snow Corsair AX1200 OK, so I got my X79 machine, I had the retailer assemble it for me and do a power test. It worked A-OK, I went through the UEFI BIOS checking all statuses and peripheral identities, nothing seemed wrong. Now that I've brought it home and re-routed a few cables, connected my old HDDs (the 6401AALS, FAEX), old optical drives (both of them) and old sound card, there seems to be a major problem; the system won't POST - if I hit the power button (whether on my case or directly on the motherboard) the system starts up for a second or two (fans, LEDs, Voltiminder and status check LEDs on the Rampage) then abruptly shuts off. It turns back on again later however, but then the process repeats; it doesn't stay on. If it helps or means anything to you guys; there is an audible clicking everytime the machine starts up, which appears to come from the AX1200. It also clicks when it shuts down. And if I shut down the mains, the AX1200 appears to hold enough charge to leave the Rampage's Start Button on for several seconds. I'm not sure if I messed up something while rewiring, or have a short circuit, or have a dead component (I noticed my TLT's fans aren't spinning either) or if my AX1200 somehow died in transit. I've tried various things like reseating all connectors, removing both the graphics card and audio card, removing all of the HDD bays (including the drives) and even trying my old HX1000's power cable or different mains sockets. What's wrong? I need to get this machine active as soon as possible.