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Computer not powering on

Level 7
I have been running my system for a few years now with no issues. i7-4790k, Asus Maximus VI Formula mobo, GTX 970, windows 10. I was in the middle of playing a game, paused to go do something and came back to my computer 10 min later and it was turned off. I went to power on the computer and nothing happened. Faint click and nothing turned on. I started troubleshooting and came to believe that the PSU had possibly died. Went to the store and picked up a new PSU hooked it up and when I went to turn the computer on... nothing. I pulled the GPU and the computer turns on. As soon as I put the card back in, in any slot, the computer wont turn on. The mobo lights come on but the computer wont turn on. I then pulled the power cables for the GPU and with the card in the PCI slot without power cables the computer turns on. I then tried plugging the PCI power cables back into the GPU and the computer powers on with the 6 pin cable plugged in, but will not turn on with the 8pin cable. I will be trying to find a spare computer to stick the card in tomorrow to see if its good, but any other ideas of what might be wrong? This is baffling me.

Level 40
Sounds like the GPU has it still in warranty?

I have had the GPU since 2015 so I dont believe it is still under warranty