santosh21 SA
@santosh21
Monitors Nov 05, 2026

thin black horizontal lines flickering across my monitor

Every now and then thin black lines run across the screen and flicker for a second. Only on one monitor, the other is fine. Tried another cable already. Is the monitor on its way out?
black lines flickering
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ira_76 Nov 05, 2026
santosh21
Open the monitor's own on-screen menu with its buttons and leave it up for a while. That menu is drawn by the monitor itself, not the PC. If the lines run over the menu too, it's the panel and no cable or driver will fix it. If the menu stays clean, look at the other end: a different port on the graphics card, a lower refresh rate, or the driver. What refresh rate is it set to? Overclocked or 'OC' modes on some monitors cause exactly this.
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