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Generally most if not all computer power supplies are switching power supplies, meaning they will show voltage but won't provide enough current to power up the circuit.
If you can find a power supply in the correct wattage with the correct mother board connector you could try running it external to the computer case.
I have propped up a few ancient computers with proprietary software that way.Ain't pretty but it can work.
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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