Question PLEASE HELP MY P7P55 LX MOTHERBOARD FRONT PANEL CONNECTORS DONT WORK

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I have started building a new pc for my self for gaming. I have a Xeon X3470, rx 480, 750 watt psu, and p7p55 lx motherboard. When i turn on the psu i see a light on my motherboard, think indicating that there is power to it and one on my gpu. But it wont turn on even with the screwdriver trick. If you can PLZ HELP ME

 

[GameableXP]

check your psu cables to make sure they're plugged in ALL THE WAY

 

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Im pretty sure they are there is a green light indicating power going to the motherboard