Pc will not boot unless unplugged then plugged in, then shuts off by itself after fans spin.

I am helping someone build a PC, this is my 5th build so I am fairly confident, however I ran into an issue I have not had before. The PC they are building will not turn on from the power switch, instead they must unplug it from the wall then plug it back in. This turns the PC on for just enough time to spin the fans and power leds then it shuts back down. I have fixed PCs turning off before, so the first the thing I had them do was breadboard. Then I ran into the issue where the Mobo speaker does not beep at all. So now I'm really baffled. My first thought was the PSU, so they are going to try to use a different PSU as soon as possible. Any help on this would be really appreciated.

processor: Intel Core i5 6500 3.20 GHz Quad Core Skylake Desktop Processor, LGA 1151
mobo: GIGABYTE LGA1151 Intel H110 Micro ATX DDR4 Motherboard GA-H110M-A
memory: HyperX FURY Black 8GB Kit (2x4GB) 2133MHz DDR4
psu: EVGA 500 W1, 80+ WHITE 500W Power Supply

Update: She did the paperclip test on the powersupply and it works fine.
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  1. I'm curious as to how you fix this issue. My first thought is that the PSU can't handle any load, if this is the problem RMA should be possible.
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