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Old 31 August 2019, 21:08   #9
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Stedy's Avatar
Join Date: Jan 2008
Location: United Kingdom
Age: 42
Posts: 653

Does your micro-ATX PSU have smaller orange wires in parallel with the larger ones?
Some ATX supplies use remote sense on the +3.3V motherboard connections, if they get no feedback, the PSU shuts off or won't power up. You could try connecting all the +3.3V wires together.

I have a 600W PSU that powers up fine with no load, though I do connect all +5V, +12V and +3.3V wires together via an adaptor.
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