Samsung used to do this for some of their cheaper monitors. I remember I bought a couple of them for one of my early dual-screen setups (15+ years ago) and every day I would slowly and gently run my finger along the entire length of the monitor until it would power on. It had to be slow otherwise there was a chance I would power it off again going back the other direction. Even more fun because after turning it on, I would slide past some other button, unintentionally opening some menu and changing some random settings (most commonly changing the input from DVI to something else). If I was lucky, I would power it off after changing something and wonder why it wasn't powering on again (note: it was powered on, but set to the wrong input). How that monitor got past Q&A I will never understand. IIRC the buttons had tiny, nearly invisible (light grey on black) icon labels... I used to keep a flashlight on my table so I could figure out which invisible button to press to get things working again.