I have a corsair tx650m. So this happened first time a few days ago when my pc was just sitting powered off but main switch was powered on. Suddenly a loud pop(bang?) sound came most likely from the psu. The first thing I did was turn off the main switch. After a couple of minutes I turned the pc on and it worked just fine even under load. In fact I played a lot of rdr2 until this happened again today. I always turn off the main switch at night so when I tried to turn on the main switch this evening, the same thing happened again. Waited a couple of minutes, tried turning on pc again, worked fine. I'm really confused as there was no smell or visible burn marks inside the psu (from what I could see as I peeked inside the psu). Everything was normal as this happened, breaker didn't pop, house lights didn't dim out or anything like that. I'm really confused now as to what to do next. Please help me out. Thanks.