This I already did with first malfunctioning and second malfunctioning psu.First check if you have the L/N/G cables correctly connected,then check the 110V/220V switch on the PSU.
Do I measure the PSU or the Board? (How and where do I do that with my multimeter)(And does it have to be on or connected to the electric network?)The next move is to unplug the board from the PSU and measure the AC input and DC output with a multimeter.
Thansku