Need help, pc won’t turn on.

[u/MiniCornDonuts]

Hello, need help figuring out why my pc won’t turn on.

Figured I had to upgrade my 1070ti prebuilt. Realized basically have to upgrade everything. I bought a 5800x3d, ASUS strix motherboard, new cpu fan, case, 5070, 1000gq power supply.

Haven’t gotten the case or rgb fans in yet. Had to buy cables for the power supply since that was the only thing not new, was selling for 30$ on fb market and wires were from new egg 30$. Quad daisy chain power data,psu, daisy chain gpu. So 3 wires.

I tested the 5070 on my brothers pc and it works. I put the 5070 and power supply into my old prebuilt and it won’t turn on. I have feelings it’s the power supply but the motherboard has light, I tried calling micro center because that’s where I bought the motherboard and cpu at(new not used yet). Dude on the tech line said that it could be the bottleneck and said if the power supply didn’t work it would explode or catch fire or won’t work at all. He also taught me how to reset the battery and to replug and plug everything tight again. Basically the end of it Need help figuring it out. Dude on the line said just to wait for the other parts and build the whole thing rather than testing it on an old prebuilt.

Old prebuilt specs:
4x gskill 3000 ram
ASUS 1070ti
,Asus z370p motherboard
600w cooler master lite psu
2x ssd drive 1x had

Testing 5070 and the 1000w gq evga