How do you know it's 12V output. Is there a more meaningful label on the side of the PSU that gives the input/output rating of the power supply?L = LiveN = NeutralFG = EarthIn the UK Live is Brown, Neutral is Blue & Yellow/Green is Earth but you will have to determine the correct colours for your country.Unfortunately the output stencil is partially obscured in the image so I cannot see if you have a +Vo & -Vo or if both are +Vo. If you have the former then be sure to connect output correctly else you may fry something important. If the latter then maybe they are different voltages.Just take care.
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