Question PSU upgrades won’t work, only the old one.

Jun 30, 2022
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I just got a 3080ti and wanted to upgrade from my 850w EVGA gq. So I got another EVGA, a GT1300 .
The pc wouldn’t post at all and I checked all wires and connections, all good. Even though the cables are all the same I put all new ones on and no luck. I exchanged the PSU for another one same model, and still no luck. The pump on my AIO lights up and clicks, then is back off . Connecting right back to old psu works like a charm. I am stumped… any ideas?