New build help?

[BAD_Brapp]

New build today. All went smoothly, I thought, but Power supply “clicks,” but the computer does not turn on.
Re did all cables and connections but still nothing, just the power supply click when turning on.
Any Ideas?

 

[mickyflinn]

List your system spec please.

 

[BAD_Brapp]

1 x DELL S2716DG 27" 2560x1440 TN G-Sync 144Hz Gaming Widescreen LED Monitor - Midnight Grey= £529.99
1 x Gigabyte GeForce GTX 1070 G1 Gaming 8192MB GDDR5 PCI-Express Graphics Card (GV-N1070G1-GAMING-8GD)= £429.95
1 x Super Flower Leadex GOLD 550W Fully Modular '80 Plus Gold' Power Supply - Black= £79.99
1 x WD Blue 1TB 7200rpm SATA 6Gb/s 64MB Cache HDD - OEM (WD10EZEX)= £44.99
1 x be quiet! Dark Rock Pro 3 CPU Cooler
1 x Gigabyte Z170X-Gaming 3 - Intel Core i5 6600K CPU & Motherboard Bundle **£30 Saving**= £324.98
1 x Microsoft Windows 10 32/64-Bit - USB Pen Drive - Retail (KW9-00017)= £99.95
1 x Crucial MX300 275GB SSD SATA 6Gbps 3D Nand 7mm Solid State Drive (CT275MX300SSD1)= £68.99
1 x Phanteks Eclipse P400 Midi Tower Case - Black Window= £57.95
1 x Kingston Savage Black 16GB (2x8GB) DDR4 PC4-21300C13 2666MHz Dual Channel Kit - Black (HX426C13SB2K2= £79.99

 

[BAD_Brapp]

Just decided to put the free power supply on that I received and started first time. Why didn't I do that 6 hours ago. MAD

 

[BAD_Brapp]

Hi, I'm going to send back the "Super Flower Leadex GOLD 550W Fully Modular '80 Plus Gold' Power Supply". Should I get a replacement or do you think it could be a compatability issue or just a dud?
I'm currently using the "GX-188-GI: Gigabyte B700H 80+ Bronze 700W Modular Power Supply" that came free, which is stable but the whole quality of it looks cheap and cheerful.
Do I keep the cheaper one in the system or replace with a new super flower?
Your thoughts please.