Dell Precision T5600 Won’t turn on

I got this Dell computer which is decent for my daughter but I can’t get it to power on.

I have two power supplies so it’s not the power supply as far as I can tell.

If i hit the PSU test button, the stuff powers on.

But the button to power it all up won’t turn on.

This one seemed pretty promising but didn’t work. It’s exactly the problem: https://www.dell.com/support/kbdoc/en-us/000145226/dell-precision-t5600-no-power

 

 

 

Dell Precision T5600 Workstation won’t turn on from Dell