A monitor that keeps going black for a moment or longer is usually caused by a loose or faulty video cable, aggressive power saving settings, a graphics driver problem, or overheating. Less often it is a failing backlight or a dying cable or power supply. If the blackouts are brief flickers, suspect the cable or driver first, then check power and heat.
Why this happens
- A loose, damaged, or low quality video cable that briefly loses connection, a very common cause of momentary blackouts.
- Power saving or sleep settings turning the screen off after inactivity.
- A graphics driver that crashes and recovers, which blanks the screen for a second or two.
- Overheating in the computer or graphics card, which can cut the display when it gets too hot.
- A failing backlight, which can make the picture go dark while the monitor is still powered.
- A loose or failing power connection or adapter on the monitor itself.
Is this normal?
A screen going black on its own after several idle minutes is normal power saving behavior. Random blackouts while you are actively using the computer are not normal and point to a cable, driver, heat, or hardware issue.
Does it cause any problems?
Brief blackouts interrupt your work and can cause you to lose unsaved progress if something crashes. They do not usually damage the computer, but if the cause is overheating or a failing part, leaving it unaddressed can let the problem get worse.
How to fix or check it
- Reseat the video cable at both ends and try a different cable, since a loose or bad cable is the most common cause of flickering to black.
- Check the monitor's own power connection and try a different power outlet.
- Adjust power settings so the screen does not sleep too quickly. On Windows, use Power and battery settings. On a Mac, use the Displays or battery settings.
- Update or reinstall your graphics driver, which fixes many driver crash blackouts.
- Make sure the computer's vents and fans are clear, since overheating can cut the display. Feel whether it happens more when the machine is hot.
- Test the monitor on another computer, or another monitor on yours, to find out whether the monitor, cable, or computer is at fault.
Frequently asked questions
Why does my monitor go black for a second then come back?
A one or two second blackout that recovers is often a loose cable losing contact or the graphics driver crashing and restarting. Reseat or replace the cable and update the driver first.
Can overheating make my screen go black?
Yes. If the computer or graphics card gets too hot, it can shut off the display to protect itself. Clearing dust and improving airflow often helps if blackouts happen when the machine is warm.
Is a black screen a sign my monitor is dying?
Sometimes, especially if the backlight or power board is failing. But cables, settings, and drivers cause most blackouts, so rule those out before assuming the monitor is dying.