I am trying to sell my old computer but I can no longer get it to boot. If I press the power button, the fans and lights start up for a second and then the entire system shuts off. I have to turn off the power supply first in order to repeat the event. At first I was thinking it was the PSU and so I replaced it with another. Same results. Then I put the original PSU that I had originally moved to my new computer back into the old computer and I'm getting the same result. So now after three PSU's and one verified to be compatible with my motherboard, I am 100% certain it is not the PSU. I also replaced the battery on the motherboard just to make sure it wasn't that either. All hardware inside the PC is the exact same hardware that was inside when the computer was working. The only change is that I removed my GTX 1070 and put that into my new computer and I formatted three SSD's which were previously inside the computer.
I have ensured that I connected the 20+4 pin and the 4x4 pin connectors to the motherboard. The only thing I might have done to damage the motherboard is I accidentally connected a 4 pronged smaller connector to the +5V/Ground/Ground/Speaker connection on the motherboard. This area is normally where you power your case LED's and Power/Reset buttons. So it's probably that when I connected that connector I damaged the functionality there? I have included a link to a picture of the spot and the connector that I accidentally used.
This is the motherboard:
ASUS P8Z77-V PRO LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Here is a picture of where I accidentally made a connection and the cable that I used from the EVGA 600BR power supply (this is the power supply I had originally reinstalled in the old computer before replacing it with another and then finally trying my original PSU).
https://ibb.co/HYfs9jg
I have ensured that I connected the 20+4 pin and the 4x4 pin connectors to the motherboard. The only thing I might have done to damage the motherboard is I accidentally connected a 4 pronged smaller connector to the +5V/Ground/Ground/Speaker connection on the motherboard. This area is normally where you power your case LED's and Power/Reset buttons. So it's probably that when I connected that connector I damaged the functionality there? I have included a link to a picture of the spot and the connector that I accidentally used.
This is the motherboard:
ASUS P8Z77-V PRO LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Here is a picture of where I accidentally made a connection and the cable that I used from the EVGA 600BR power supply (this is the power supply I had originally reinstalled in the old computer before replacing it with another and then finally trying my original PSU).
https://ibb.co/HYfs9jg