Most switching power supplies with a +5V high current section require a 3/4 to full load on the +5V in order to determine if all the other sections [-5, -12 and +12] are struttin' their stuff. You could have a supply on the verge of quitting entirely. You might have to borrow a couple/three voltmeters and after pulling the power connector from the mobo and putting a power resistor of at least 3/4 load capacity into the +5 and ground bus of the P.S. connector, check the other voltages to be sure they are there. Might involve a few on/off sequences while watching the meters - intermittent problems are a PITA!
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