Screen is too dark and won't brighten

Symptoms

• Screen looks dim even at maximum brightness setting
• Brightness slider doesn't seem to do anything
• Screen is fine when tilted or viewed at an angle (laptop)
• Problem started after a software or driver update

Likely causes

• CommonBrightness set low in OS or monitor settingsThe simplest cause is that brightness was accidentally turned down.
• CommonNight Light, True Tone, or blue-light filter enabledThese features dim and warm the display and can make it look darker than expected.
• CommonPower-saving mode limiting brightness (laptops)Battery saver modes often cap maximum brightness.
• PossibleFailing backlight or inverter (older monitors)A dim or uneven backlight is a common wear issue in aging LCD panels.
• Less commonAmbient light sensor auto-dimming incorrectlyA sensor that's covered or malfunctioning can force the screen to stay dim.

What to do

1. Increase brightness using the monitor's physical buttons or the OS brightness slider, confirming it visibly changes.
2. Turn off Night Light (Windows), True Tone (Mac), or any blue-light filter feature temporarily to test.
3. On a laptop, unplug from battery saver or switch the power plan to 'Balanced' or 'Best Performance' and recheck brightness.
4. Check for anything covering the ambient light sensor, usually near the webcam on laptops.
5. On an external monitor, open the on-screen menu and look for an 'Eco' or 'Power Saving' picture mode that limits brightness, and switch to Standard.
6. If a laptop screen looks brighter at certain viewing angles, this points to a backlight or panel hardware issue rather than a setting.

Tools and parts

• None

When to call a pro

If brightness is maxed out in every setting and the screen is still dim, especially with an angle-dependent brightness change, the backlight likely needs professional replacement.

Safety