Comet ATX board detecting PC On state

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I have just added an ATX board to an old machine I use for backups, it’s a Dell XPS8700 which does not have standard ATX wiring.

After moving pins around on the Dell cables, I now have everything working with the exception that the ATX board does not report the ATX Power On state.

Does anybody know which signal/wires this uses to report this, I would have presumed simply power on LED?

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You mean this one? Ah, it read on/off state from the power LED pin.

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Thanks, thought so, a little more wire swapping to do then.