Intel D865PERL Power-on circuit failure X2

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I have two computers with Intel D865PERLL boards, both on UPS. Following
power outage, both PS-ON circuits seem to have failed. Motherboard led
is on. Bench tested both boards with known good processor, power
supply, memory, video card. Have checked power supply with voltmeter.
Have manually shorted PS-ON pins to check cabinet switch. Jumpered bios

Anything I am missing?
Thank you in advance for any suggestions.


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