Check the monitor cable connections
Try a different HDMI, DisplayPort, DVI, or VGA cable
Reconnect the cable firmly on both ends
Test a different port on the monitor and computer
Restart the computer and monitor
Reset the monitor to factory settings
Disable any monitor color modes or presets
Adjust brightness, contrast, and color temperature
Set the correct input source on the monitor
Update the graphics driver
Reinstall the graphics driver
Check display settings in the operating system
Calibrate the display color settings
Turn off Night Light or blue light filter
Disable HDR if colors look incorrect
Test the monitor on another computer
Test another monitor on the same computer
Check for bent or damaged pins on the connector
Replace the cable if it is damaged
Update the monitor firmware if available
Contact monitor support if the issue remains