Now I'm not sure if the PSU (Corsair CX450) is to blame, but this is what happens: I'm gaming for a while, and my screen goes black. I don't hear the CPU and GPU fans, and the LED strip in the case is also off. The only thing that stays on is the power LED. PC doesnt respond to reset or power switch until I flip the switch on the PSU to 0 and back to 1. Then I can turn on the PC, and the PSU fan goes really loud, louder than I ever heard. I feel warm air coming out of it. After 3-4 minutes the fan goes back to being barely audible and I feel no heat coming out. This has happened twice now. I've had this PC for 9 months and had no issues with temperature or power requirements so far.
Gonna keep a close eye on temps while gaming from now on, but how can I know if it's the PSU or not?