Last year I bought a psu EVGA SuperNOVA 750 G3, 80 Plus Gold 750W, Fully Modular, Eco Mode with New HDB Fan. When I hooked it up to my pc it wouldn’t boot, I then reinstalled my old power supply and it booted fine. So I just put the Evga power supply away because it was past the 30 days of original purchase and couldn’t be returned on Amazon. Well I just bought a 4070 and while I probably don’t need to upgrade my psu I was thinking I might as well since I already have one not in use.

I know I have a 10 year warranty so before I send it back to Evga I was wondering if I keep the psu I have in my computer now (seasonic gm-550 gold) and plug in the Evga psu outside my case can I run both psu and test the cables one by one on my Evga to see if its just one of the cables that’s the problem? When I press the “test” button on the Evga psu the fan spins and it sounds like it’s running that’s why I assume it’s potentially just a cable that’s the issue, but I don’t want to damage any components and I don’t have a multimeter or know how to use one. I think it’s the 24 pin Atx motherboard cable and the price to replace the cable would be cheaper than the RMA shipping cost.

Any help or suggestions would be appreciated

No help needed here; just posting this for the record in case someone is on the internet looking for an answer like I was an hour ago. Maybe the answer is obvious, but I'm new to this all, and it wasn't obvious to me.

Some EVGA PSUs are equipped with a feature called "Auto-Eco Mode" whereby the fan will only activate if the PSU gets hot enough. This is distinct from other EVGA PSUs with (manual) Eco Mode, which have a switch to manually enable or disable Eco Mode.

When running a paperclip/self test an EVGA PSU with Auto-Eco, you should expect the fan to start briefly, then stop.

I confirmed this with EVGA support over the phone. For some reason, this isn't explained in the PSU manual or on EVGA's website (that I could find).

I just tried to move my PC into a new case and I can not get it to power on for the life of me. I've check'ed all my connections 20 times now and I still can't find anything of note.

The way I see it is either I fried my Motherboard during the switch or that my PSU has decided to die on me. I'm more inclined to believe the board is fried because it has a little green LED that lights up when I connect it to the PSU but I can't completely rule out the PSU being faulty or only partially working.

So for the main part of my question, Do any of you know if there is a way to test an Evga Nex650G without having access to another computer or a multimeter?