thanks for this info, so i can just plug power supply "alone" and if i heard the noise, that means power supply works ?? i can do it with no risk to damage power supply ??

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Well, the best test is to plug the power supply into an Apple II, but if you hear the clicking when the power supply is not plugged in to an Apple II, then that is a decent test as well. You shouldn't damage the power supply, but don't leave it on for a long time, just a few seconds.