CPU/Mobo PC wont start after assembly

maddy_in65

maddy_in65

Adept
This is my first home built computer, I assembled it using various online videos and tutorials. When i connected power supply to electrical socket, there is no led or anything on PC case or motherboard.
I am using Corsair CX430. I afraid i have done some wiring connection wrong. Please can someone advise What needs to be checked in order to find what goes wrong.
 
Have you plugged in the EPS 12V and primary ATX cables in tight. Also press down firmly on the RAM and GPU docks. Usually a loose fit somewhere, if you assembled it correctly. Remove the USB headers for now to relieve the cabinet of some clutter. Also are the SATA HDD connectors placed in firmly.
 
I am not using any graphic card in system. I Checked motherboard with only 12pin connector but PSU is not working. I am going to check it at Corsair service center.
 
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