Re: On going power supply question??
What type of power supply are you using? Brand, model, etc.
The full scale amps and no volts indicates an excessive load with the power supply going in to current limiting (that's why zero volts, high current).
The black button may be an output circuit breaker or a way to set the current limit. No load you push the button and set the maximum current. This, of course, is if it has such an adjustment.
I do not know of any power supply failure that could cause this and not open the main fuse or circuit breaker. Shorts on the output reflect back to the input.
There could be an overvoltage circuit that has failed and is tripping at a lower voltage than originally set, but usually they completely shut the power supply off or open the main fuse.
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