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My decade-old secondary desktop computer monitor faded to black and then after a power cycle made an ear-shattering white noise scream. After another power cycle it crackled for a while and then was back to normal.

Presumably I’m meant to conclude it’s possessed…or dying. I’m pretty amazed that it lasted this long, given I bought around 2012 as some cheap crappy thing with a dodgy power adapter from Kogan (Aussie Amazon-alike online retailer known for selling unreliable Chinese rebrands).

@MossRC sounds to me like a capacitor vented and spread it's guts in the power supply.

@gentarkin That’s a very visual and graphic explanation. I don’t know if I can be bothered to open it up to find out, given that I’d been thinking of replacing it anyway.
Gentarkin

@MossRC Yeah, I wouldn't bother either given what age the hardware is. Just thought I'd offer an explanation for the noise. I've heard it before from an Xbox 360 once.