first thing you need to do is remove the JED that you add, unplug the power cable. if the PSU have a power reset button hold that in see if show green. if it does your PSU is good. with the power cable still out, hgold your PC power button for 15 to 20 seconds. then plug in the power cable and power on the PC.
i never saw where you mentions what was the wattage on the video card and the PSU. if you are pulling too much power you will nto be able to power on. Also are the LED light pulling power directly from the PSU or is there any connection to the MOBO.