Are your tests with the power supply boards unplugged?? Not connected to anything?? If so then quite a lot of both boards seem to be bad.? They are both shorted to ground enough that the current limiting is restricting the voltage.? You talk about holding the start button down, that won't be connected if the boards are unplugged.
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100mA is a bit low for a test with the boards fitted because the processor takes about 200mA on start up.? It might be worth increasing the current limit and see if VDD will get to 3V.? Don't go over 250mA, if that isn't enough there's something failed.
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Chris, G5CTH
