Built a PC with used parts but it won't display anything on the monitor

Mar 21, 2018
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Recently built PC turns on and the fans spin but there's no signal on the monitor. Here are the specs:
Motherboard: Asrock N68-VS3
CPU: AMD FX-4100
GPU: ASUS GeForce GTX 550ti
RAM: Dual channel 4GB RAM
PSU: 400W unknown brand
HDD: 500GB