Xbox one s No Power - no shorts, all standby good

No power, no beep, no fan 1/4 turn. PS is good at 12v, all standby voltages are in spec. The mosfets for the three phases test fine. I did see or read somewhere (cant find it now) that the hdmi retimer can cause a no power fault, is this in fact true? I didn’t want to pull it if it’s good, or not a possibility, as i have no donor board. Is there a procedure to test with a multimeter?