No image or power in USB ports

So a little while ago I bought a new PC to replace my 5 year old junkyard. Initally I wanted to use a few new parts and use my old PC for the most, but It seemed wiser to choose a new PC built by smarter people than me.

Since it had an integrated graphics card I thought I'd install my old Nividia GTX 970 GPU. For that I'd also have to install the powersupply from my old PC (600W instead of the 200W). I also added my old harddrive just for the heck of it.

I was pretty proud when I turned it back on; Lights were working, fans were running and everything seemed to be powered. When I connected it to the VGA cable (which I inserted firstly in the motherboard entry), I noticed I had no screen nor USB power coming through to my keyboard and mouse. I plugged the VGA cable (with an HDMI converter) into the GPU, but same result.

I eventually decided to remove the GPU. But same result. I decided to follow the advice of the internet and reset the CMOS by removing the battery overnight along withall other power cables. No results.

I don't hear a beeping like I used to hear when the PC would power up. Nothing on screen and no power to any of the USB ports.

Specs PC:
Cpu: ryzen 3 2200
Gpu: AMD Radeon RX Vega 8 and I added GTX970
Power supply: Coolermaster 600W (used to be a 200W)
Harddrive: 1tb harddrive and added 2tb harddrive

I'm out of things to do here, please help a poor man out!

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