The X9SCV-QV4 is embedded motherboard used by our customer’s custom power supply or 12V DC input power supply with 4 pin def following our manual or ATX 12V pin def. If you are using standard ATX 24 pin power supply for burn in, please short the COM and PS_On# pin when power off and plug in the power supply’s 4 pin 12 V adapter to the motherboard short before power on. If these two pins are not connected, the 12V DC out from the ATX will not provide output.
Customer may need a DC input like Pico solution.
http://www.mini-box.com/picoPSU-150-XT