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I guess the RAMs get too little power. Possibly something on your mainboard is defect. Unfortunately it is hard to get an replacement mainboard to test against your current one. The -12V real voltage is pretty weird - I am not aware that this current is generally needed on mainboards - but it might be an indicator for something that draws a lot of power, so that the -12V current of the PSU collapses. If you have a voltage meter, you could try to figure out if the PSU generates the -12V correctly when it is not attached to the mainboard.
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