The peripherals' lights stay on without your computer being powered on.
The peripherals' lights stay on without your computer being powered on.
I reside in a boarding house that was once an industrial site. It has just one plug, and I’ve connected all my devices—PCs, stove, fan, router, etc.—using an extension cable made from high-quality material. The room still uses fluorescent lights with ballasts. Often, whenever I switch on or off the lamps in my room, my PC peripherals’ LEDs (like the RGB keyboard and mouse) would activate by themselves, even when the PC is off. I suspect the ballast in the lamp is making the PC behave oddly, possibly causing USB ports to power up unintentionally. To be honest, my extension cable lacks grounding, as it’s just a standard 2x1.5mm connection. I’d prefer 3x1.5mm cables but can’t get them locally. I’m aware of the risks and plan to switch to a proper ground later. Still, regarding your question: replacing the cable with one that includes grounding might help, as it could prevent power issues caused by missing ground connections.
It's concerning at multiple points, isn't it? I'd start with solid grounding, but some motherboards might still power the PSU, leading to your peripherals lighting up. Also, does your phone charge properly when connected?