linda_mary LI
@linda_mary
Monitors Oct 27, 2026

Horizontal red lines and dots all over my monitor

Started a few days ago, red streaks across the screen and random dots, worse when the PC warms up. Swapped the DisplayPort cable, still there. They don't show in screenshots. GPU dying or the monitor?
screen red lines
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dan_gadget Oct 30, 2026
linda_mary
Open the monitor's own menu with its buttons and look closely. If the lines show up over the menu too, the monitor panel itself is faulty and nothing on the PC will fix it. If the menu looks clean, it's coming from the PC or the cable. Try a different cable and a different port, and if you can, plug a laptop into the same monitor. Red dots and lines that only appear in games or get worse as the PC warms up point to the graphics card, so check its temperatures and update the driver. Which one is it for you?
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