New psu / gpu pc wont start

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19 Nov 2014
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Gigabyte Z370P D3 MOBO
Super Flower Leadex III 550W 80 PLUS Gold
Intel Core i5 9400F 2.9ghz
Vulcan T-Force 16GB (2x8GB) DDR4 PC4-19200C14 2400MHz
Zotac GeForce GTX 1060 Mini 6144MB GDDR5

Recently upgraded my psu to 850w and a Radeon 6700xt when all connected pc won't start could this be faulty psu or gpu can I unplug the gpu and try booting up would this work? Both items brought on ebay.

Many thanks
 
So nothing happens when I boot no fans or nothing. My old psu has a vga slot not a pci which the new gpu uses do not sure I can run it off the old psu.

Old psu and gpu still works I didn't upgrade the Bios I will do that later.

Both 850w and gpu are new so I haven't tried them before.

I'm thinking of trying to boot without the gpu connected later
 
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Corsair RM Series RM850 850 Watt 80 PLUS Gold Certified Fully Modular PSU I did originally try the old cables only once. Have I ballsed it you think
 
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