Hi, I have a question. I just bought a Seasonic SGX-650 2 months ago. When I flipped the switch to turn off the PSU, I heard a short cracking noise. It was the same noise I heard on my previous PSU Seasonic S12-III. Is the cracking noise normal? It doesn't happen all the time BTW and the PC still boots; I'm using it right now. The PC is connected into an APC UPS. I cannot tell if what I saw was a spark on the PSU or it was my ethernet blinking since I was looking at the top of my PC when it happened.