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By connecting the usb, you alrady make contact between the two powersupply's
(my screen moved while there was no power on the powersupply). The power came frome the second cable of the usb hub, witch was fed by that powersupply.
can't answer the usb standby, haven't tride that.
But your problem remains, that by switching it with the ignition and a relay you take away the power before the mobo is switched of, or gone into hibernate. You need to delay the switch off.
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