Power not working, LED is ON

@samkleven could be a power board issue or a main board issue. Check the No Power flowsheet

See if you can narrow it down by measuring C518 (it's the size of some fly droppings :-) for 3.3V standby voltage

. You may also find that voltage on your power board, but for that we will have to see the connectors and the legends for those. B-Board should be the main board (BMKS board) If you post some really well focused pictures of your boards with your Question, I am certain we could point things out to you.

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@samkleven check CN6407. The legend is on the board just below the large 4700µF capacitors. If you are unsure about the pins etc. take another close up picture of the connector and the legend so we can point out the pins. #1 is on the inside, top of your picture. You will have to take the measurement with the power on. So be careful so as to not shorten out the pins (or getting accidentally zapped :-). I usually take the measurements on the cable side. Kind of like poking the probe into the connector were the cable is. See if you have all the voltages as outlined in the legend. Also, check PH6301 (could be a gate or a voltage regulator). If you can make out the writing on it, let us know so we can do a quick check on what the voltage should be). Otherwise, I do not see anything grossly abnormal on neither board but take another well focused closeup of this area