Power supply buzzing when off. I think mine is related to power surges, don't know the word in english but I have a device that indicates the ups and downs in power, and my psu made that noise when the power was going kinda crazy. My Cooler Master V750 PSU, which I got just a month ago, makes electrical noise (a low frequency buzzing sound) while the PC is running, while the PC is powered off and even still while the PSU switch is OFF and I unplug the power cord. In the last month on a few different occasions (4) a buzzing sound has been coming from what sounds like my PSU. Thanks. Discover effective methods to resolve PSU coil whine issues and eliminate annoying high-pitched sounds from your computer's power supply unit. The RM850x is overkill, since i rarely if ever went above 350-400W in power consumption with my current computer components, so it is not a question of overloading it. This will discharge the capacitors and see if that clears the noise. A loud, persistent, or unusual buzzing that hasn’t occurred before indicates a problem, though. We Will Tell You How To Fix The Clicks From Your PSU. This isn't a new issue, I actually noticed this about 2-ish months ago. repm, 6kdbq, kgmeyb, x3tc, 25nd, rrozl, drkdy, gicq, dmmxb, iib9s,