A blue line appeared. It came out because very young cousin messed with the buttons under the monitor. I'm sure it's not dead pixels because each side have different contrast/brightness, other side
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PHILIPS 275V8LA - 27 Inch QHD Monitor, VA, 4ms, 75Hz, Adaptive Sync, Low Blue Mode, Flicker Free, Speakers, Vesa 100, Tilt (2560 x 1440 @ 75Hz, 250 cd/m², HDMI 1.4 / DP 1.2) : Amazon.co.uk: Health & Personal Care
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Monitor Philips UltraWide curbat cu Tehnologie B Line, 3440 x 1440 WQHD, 34" (86,36 cm), 21:9, Antireflex, Sistem WLED, 300 cd/m2, SmartImage, sRGB, Mod Low Blue, Negru - eMAG.ro
Why There Are Blue Lines On Monitor? First Learn Then Solve It! - Easy to Fix - Alt Gov
![SOLVED] - Vertical Blue Line appears on the monitor | Tom's Hardware Forum](https://i.imgur.com/ghSCvQRl.jpg "SOLVED] - Vertical Blue Line appears on the monitor | Tom's Hardware Forum")