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Originally Posted by Shadowmeph  well what I do to test voltages is I use my volt meter and put the black wire ( Ground ) wire from volt meter and push it into the black 0n the 24 pin plug on the Mother board then I fire up my system at idle and go through the yellow reb and orange wires measuring then volts the orange wir output should be around 3.3 volts , red wire is around 5 volts and yellow is around 12 volts. Non of those wires should drop below those voltages , then I load up my system to 100 % and retest the wires.
best way to do this is with the Motherboard out of the case |
This is honestly the best method. Power supply testers do an ok job measuring voltages and rest and can give you a general idea but they are never 100% accurate.