Ragingsoul

yeah I switched back to my old PSU, and the problem is gone. doing the RMA now too.

No, I think you missed my point, or maybe I didn't express it correctly. Whenever you switch an electrical device on, because of the Condensers, you will have a peak of current far greater than once the voltage is stable (I'm not gonna make an electronic course here). Depending on the motherboard, this could be quite high and might be flagged as a short circuit for the self test, that's why I asked. I still didn't have the problem back since sunday at the moment.

Can you explain how the self test is done? I can pass it with everything plugged in, except the 10 pin power for the Motherboard. Since Motherboards tend to drain a lot of amps right at the start to start everything (and every fan on max), would this behavior alter the power Supply self test? When the 14 pin part is connected to the AX860i, it still passes the self test, and since the motherboard isn't fully powered, the system doesn't boot of course. I guess you can't do a self test with everything plugged in since it would mean a system start up, right? I redid the cabling behind the Corsair Graphite 600T Midi-Tower on sunday, to have something cleaner, if I still have a random shut down with this done, I'll post here again. It seems more of a motherboard issue than powersupply, but maybe it was just a cable not completely in (even if I rechecked things like 10 times). Hopefully, the sunday's clean up by removing every cable and replugging everything have solve the problem.

For the past couple of days with my new system, I had some problems with it suddenly shutting down, and the led going red on the Power supply. When I Disconnect every cable, the self test pass, when I connect everything BUT the ATX for the motherboard, self test goes green. When the motherboard is connected, I have no light if I try the self test. Is that already normal or not? The PC, can run with normal frequencies and voltages, or OCed, it's the same thing. It can be on idle, or doing something, happened on every situation. I can't see any relation here. I don't know if it's either the House power fluctuations, the Motherboard or the powersupply which is causing this shut down. The only way to restart the PC is by switching the Power supply off and on again. Some days, it works without any problems. The next, I have 3 shut downs in 4h. I ran intel burn tests and prime for a couple hours on various days, and no problem here. Is the self test suppose to be green no matter what I plug in? if there is a short circuit with the motherboard, how can I detect it?