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Diagnose a dead Motherboard, or PSU

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Subject: Diagnose a dead Motherboard, or PSU
From: d.clayto...@gmail.com (Max Collisions)
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by: Max Collisions - Sat, 17 Dec 2022 23:19 UTC

My Shuttle XPC has stopped working.

So, what is the procedure to diagnose whether a fault is with the motherboard or the PSU, when there are no beeps, no LED (Voltage Good) Signals, or lights.

What I have done: Installed a known-good PSU for what I think is the dead one. (1)

Do you put connect a working PSU into the machine, and check voltages of the ATX1, and ATX2 output ?
Currently, I'm lucky, that when I moved the SSD hard drive, and Radeon GPU, into the less Powerful shuttle, with an FH61R motherboard, Windows 10 pro did not complain.

The ATX2 power socket on the XPC motherborad, has a 4X4 connector, the "spare"PSU"'s have an ATX2 connector that has only 4 connectors, which fits snuggly only one wasy on the Motherboad.

Subject	Author
Diagnose a dead Motherboard, or PSU	Max Collisions