Question PC won't boot after first being built

[b_enwilson]

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

 

[Dark Lord of Tech]

Without detailed PC specs hard to assist.

 

[b_enwilson]

Without detailed PC specs hard to assist.

Sorry,
i5 3470s
intel dq77cp motherboard
16gb crucial ddr3 ram
gtx 750 ti
cit 500w power supply