Fix monitor that goes black, off or blinks due to static electricity in chair

The weird problem

Remote work can throw up strange gremlins. It has been reported that some people plugging laptops into external 4K monitors suddenly see the screen blink, go black, or power off whenever they move in their chair or stand up. Frustrating? Absolutely. One blogger describes pairing a MacBook Pro with an external monitor and an Ikea Markus chair and watching the display drop out with a tiny jolt of static — sometimes requiring a cable replug to get the image back.

What's causing it

What’s going on here? Two culprits. First: static electricity building up on non-conductive chair parts and discharging when you touch a metal surface. Second: allegedly, gas‑lift office chairs can create electromagnetic interference (EMI) spikes when a person stands or sits, and those spikes can couple into DisplayPort or adapter cables and upset the video signal. It has been reported that vendors like DisplayLink have documentation about the phenomenon and that the effect is especially noticeable with DP links and some USB‑C/adapter combinations.

How to fix it

Good news: fixes are low‑tech and cheap. Ground the chair — one user looped a small metal chain from the chair base to the floor (wooden floor, in that case) and saw static shocks fall from dozens a day to almost none. Add ferrite cores around video cables to suppress EMI spikes; DisplayLink and other users reportedly recommend this. In practice people have found combining grounding and ferrites stops the blinks without ripping out expensive kit or replacing monitors.

Why it matters

This is a small, annoying bug with an outsized emotional weight — nothing wakes you up faster than a black screen during a meeting. The takeaway: before blaming the monitor, check for static and noise sources in your chair setup. A few euros and five minutes of tinkering could save you from more hair-pulling down the line.

Sources: aalonso.dev, Hacker News