Question PC won't boot after first being built

Nov 13, 2019
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Hi,
I have an issue with a pc I have just built using mainly used parts. When I turn on the pc the lights on the motherboard appear but nothing else happens. No fans spinning, noises from the motherboard or anything. I have unplugged and replugged everything back in and know that the issue isn't a loose connection. I know the power supply is working but don't know what else the issue could be. Any advice would be very appreciated, Thanks