See step 9 of this guide.
I had the same symptoms as you. When I opened the case to investigate what I had missed, I discovered that I had installed the IO Board Cable backwards. After I disconnected the cable and reinstalled it in the correct orientation, the laptop booted without issues.
I advise that you check the orientation of your IO board cable. It should not overlap the blades of the fan.
Maybe you are having a different issue. I hope this helps.
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