measure your 3.3, 5, and 12v rail with digital multimeter..while idle and full load..
not with software, but digital multimeter hardware..a real digital multimeter..a real one..
if it show stable or just show very little drop while load, that's mean your psu is okay..
but if it drop too much, congratulations, then you've already bought a faulty and defective a corsair gold psu..
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like usual, rma it..
if your psu is okay, then try to reseat all connector..make sure all of it connected well..
if all of your connector is okay, try to build your machine outside the case..may you have some electricity short..
if you have already build it outside the case, but problem still persist, then -once more again-, congratulations
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, then your processor is already degrade..well, please easy with your processor, decrease the clock and see the result..
if you already decrease your clock but problem still persist, well..then there's something wrong your motherboard...