new build all complete and bam no power from PSU.All i hear is a super low pitch wine and very very soft beeping noise.You have to get your ear right next to the power supply to hear the very very soft whine and soft beeps.
Here's a but of info for your brother Seasonic actually makes many of Corsair's power supplies. Seasonic is one of the best brands in power supplies. But it is still possible its DOA but without further info I wouldn't jump to conclusions. What are the rest of the system specs? Have you tried it outside of the case? Have you double checked everything is properly connected?