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PC Startup Issues

I have a built pc that I am trying to clean up and sell. Today installed a new HDD and did some wire cleanup. Now the PC will do one of two things. It will power on and stay on but I have no signal or it will power on, have signal, and then shutoff after about 30 seconds. I have pulled the graphics card, went to one stick of RAM, and reset CMOS. Still has the same behavior. Checked voltage on PSU and all is good there.

It was working fine before, I have tried pulling the power from the new HDD same results. I have never seen this kind of behavior before.

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