New PSU, Computer still won't turn on

Hello,I recently installed a new PSU after my computer would not longer turn on. I performed the "paper clip" test where I plugged it into the green and black connectors as well as the DVD drive and the PSU fan turns on. However when I connect it to the motherboard, the LED light from behind the power button (for the computer) will briefly turn flash and that's it. The CPU fan may slightly nudge. I tried to remove the Power LED and the ATX SW connectors that ran from the computer power button to the Motherboard. With them removed I tried touching the two connectors with my flathead screwdriver but still nothing. Does any one have any tips for things that I can do?
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