Check that the fan in the power supply is spinning .
And even if it is I think you need to try another psu to see if that makes a difference
The psu fan does spin up. I tried swapping out the psu with a spare and it still does the boot loop.
When I remove the power plugs from my video card it sits on a screen telling me to make sure the power is plugged into the video card and does not continue to cycle on the boot up.
Sometimes with everything connected I can get it to load windows and right before the Windows login screen would come up it will begin cycling again. But that is the furthest it will go.
Any assistance on this would be greatly appreciated.