Why is the power switch on my desktop not working?

I recently rebuilt my desktop - new motherboard, processor, PSU, graphic card, RAM, DVD drive, case and hard drive. When I turn the power switch on the motherboard LED lights up indicating power is flowing. However the front panel is not lighting up and I can't turn on the computer. I have triple checked the... show more I recently rebuilt my desktop - new motherboard, processor, PSU, graphic card, RAM, DVD drive, case and hard drive. When I turn the power switch on the motherboard LED lights up indicating power is flowing. However the front panel is not lighting up and I can't turn on the computer. I have triple checked the connectors and they are all in the right slots but there seems to be no power going from the PSU to the front panel. Does anyone have any idea why this is? I am completely stumped.
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