Have i received a faulty power supply?

Lynd

Honorable
Nov 17, 2013
4
0
10,510
Heya, i recently purchased a Seasonic G series 550w '80 Plus Gold' Modular Power Supply for my computer, yet when i installed it, nothing happened. When i turned on the power button, it lights up saying its on, the front fan runs, but that is all, nothing else happens, and it says on my monitor no signal been received. Now, i have checked, double checked and triple checked making sure that the cable pins are in nice and securely, and they are. My computer ran fine with its old psu, but that started to overheat pretty easily, so i decided to change it..
Anyways, heres the spec's of my computer if it helps:-
Intel Core i5 (3570) 3.4GHz Processor 6MB L3 Cache 5GT/s Bus Speed (Boxed)
Kingston HyperX Blu 8GB (2x4GB) Memory Kit
Gigabyte GA-H61M-USB3V Motherboard Core i3/i5/i7/Pentium/Celeron Socket 1155 Intel H61 Express Micro ATX Gigabit LAN
Toshiba 1tb 3.5"
XFX Radeon HD 7850 Graphics Card 2GB
CCL Choice 22x DVD+/-RW Drive
CiT 1017 Black Part-Mesh Midi Gaming Case
Any and all help will be greatly appreciated! thank you for reading :)
 

Lynd

Honorable
Nov 17, 2013
4
0
10,510
No, diddent forget any. Made sure the 24 pin and the other one was in the motherboard, thats in nice and secure, the graphics card, the disk drive and the harddrive are in secure, and the front fan one is in securely aswell. I had my uncle look at it take a look in and he said they was all in to.