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Al Schwartz
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One of the issues with switching power supplies (all computer supplies are in this category) as opposed to linear (transformer operated) supplies is that switching supplies often expect and need some minimum current draw to maintain regulation. You might be able to "trick" one into behaving correctly by putting a permanent resistor, e.g. 120 ohm, 5 watts, across the 12V leads. this will pull 100 ma and should kick the supply into the regulated region. I don't know if a similar cheat would need to be applied to the 5 volt side.

EM

ps. the resistor will be dissipating 1.2 watts - a 5 ohm part will get warm but should hold.
 
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