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I had a similar problem when I built my current PC. Power was getting to my board but it would turn on the off when I powered it up. Turns out I just forgot to connect the extra 8-pin power plug on the top of the board. It looks like you have a 4-pin, 6-pin and 8-pin that need to be connected, are those all plugged in besides the 24-pin plug? It looks like the 6-pin connector next to your cpu isn't plugged in. Maybe that's the issue?
Yeah you can use one of your spare 8-pin / 6+2-pin cables no problem on it. Hook it up and see how it goes.