Intel D865GLC custom box doesn't POST

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https://bbs.archlinux.org – Perhaps a power supply failure of a critical supply source preventing the cmos bios from running.Remove the PS, connect a jumper from pin 19 (green) to ground (black wired pins, perhaps 20 or 21).  This turns on the supply.The fan in the supply should run and stay running.Then, using a listing of interface voltage levels for the power supply....probably ATX standard if a desktop...measure the presence of all voltage levels at the interface cable connector.  Any missing voltage  would indicate a bad power supply.Alternative, install or connect a temp power supply to the computer (HowTos)