Ha, yes, who needs a multi meter when a little logic & a spare driver are the troubleshooting tools? Nice work Mrs. Spock. Another way to perhaps confirm that it is indeed the power supply without resorting to multi meter magic is to look for the little green light on the power supply, or try another power supply if you have a spare kicking around. I have one fairly old MP40 & it's power supply has the green power light, so it's safe to assume anything newer has the light.
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