Uploaded February 2019 | Updated September 2026, 1 week ago

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Testing an IBM power supply from an old IBM PC (51510 / 5160 / 5155) without it being connected to the motherboard is not trivial.

I had read online that the IBM PSU won't start if there is insufficient load on it, and adding a hard drive or a fan is simply not enough.

I decided to put this to the test, and see what was needed in order to start the IBM PSU.