Check that the monitor is powered on
Verify the power cable is firmly connected
Try a different power outlet
Check that the video cable is securely connected
Reseat the HDMI, DisplayPort, DVI, or VGA cable
Try a different video cable
Make sure the correct input source is selected on the monitor
Restart the computer and monitor
Test the monitor with another device
Test the computer with another monitor
Check for bent or damaged pins on the cable or ports
Adjust brightness and contrast settings
Reset the monitor to factory settings
Update or reinstall the graphics driver
Check display settings on the computer
Try a different port on the computer or monitor
Remove and reconnect external adapters or docks
Inspect for physical damage on the screen
If the screen is cracked or has internal damage, replace the monitor