I purchased an EVGA Supernova GT 750w PSU to replace the one in my gaming PC which had a fan which was failing. I received it and hooked it up and had problems from the beginning. For context: I plugged the MB plug into the motherboard, I used both VGA ports/cables and connected the 2-6+2 pin adapters into my GPU (rather than using one daisy chain), plugged in the 8 pin power to the motherboard, and plugged in my sata and molex peripherals. My motherboard has a second 4-pin power slot but I've never had to use it with any previous PSUs. My PC started as a prebuilt and the company didn't use the 2nd 4-pin power slot either.

I tested the PSU with the included tester before installing and the fan spun for a second and then stopped...which appeared to be fine as the fan won't spin in ECO mode.

After hooking everything up to my PC, I turned on the power switch on the PSU and let it sit for about 5 minutes. Then I powered on my computer. Everything appeared to be fine until my PC went black and shutdown after being on for about a minute. I double checked all my cables and connections and checked for any possible shorts and there were no issues there. I powered my PC back on and it shutdown after about 8 seconds and then kept cycling on and off, each time shutting down after about 8 seconds.

So I took an older PSU that I have and hooked it up to my PC and unhooked the EVGA PSU. On the old PSU, my computer fired right up and ran fine.

Is this likely a faulty PSU? I purchased it through Amazon and was within my return/replacement window so I am just exchanging it for another identical PSU rather than filing an RMA because, quite frankly, Amazon has a speedy return service. My replacement will be here in a couple days and hopefully that one won't have the same issues.

Has anyone else ever had this issue? Was I right in determining that the PSU was defective?

P.S. I have an EVGA FTW3 Ultra 3060ti which has never had an issue so I have confidence in the EVGA brand but was a little disheartened by my experience with the PSU

I received the replacement PSU today. I will post again after I get it hooked up and tested. I'm hoping and praying that everything goes well this time. Fingers crossed! If this one fails, im returning it and going with a Corsair. Fail me once, shame on you. Fail me twice, shame on me.