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Hello there, Jo. We understand your inquiry about the LG 34WP65C-B monitor experiencing a deep blue‑black screen. Let’s try a quick troubleshooting step: Perform a Hard Reset Disconnect the power cord and video cables (HDMI/DisplayPort). Press and hold the monitor’s power button for 10 seconds. Reconnect the cables and power, then press the joystick to turn the monitor back on. LG Monitor - Troubleshooting A Blank Screen - https://www.lg.com/us/support/help-library/lg-monitor-troubleshooting-a-blank-screen--20153188064348 If the issue persists, please send us a private message on social media @LGUSSupport. We’ll review your purchase details and coordinate a replacement solution for you as soon as possible. —Renzo
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