corsair rmx750

Hey Guys, I recently got a new PSU, the Corsair RM750x (2018). Today when I was playing Horizon Zero Dawn I noticed this strange buzzing sound, which I could only assume was coming from the psu. I think I read somewhere that the fan of this particular psu only turns on during high workloads...

This has been happening over the last few days, and I've had this computer for the last year or so. The lights are lit on the motherboard and I even have a couple of earbuds charging on the front panel of the PC. However, when I press the power button the computer doesn't start. After a few...