# 25. Computer Monitor Shadowing: What Causes It?
Monitor shadowing describes a visual problem where text, icons or moving objects appear to have faint duplicates or shadows beside them.
The term is sometimes used interchangeably with ghosting, but shadowing can also be caused by connection problems, image settings or signal quality.
The exact fix depends on when the effect appears.
01
Is shadowing the same as ghosting?
Not always.
Monitor ghosting usually appears during motion because pixels are changing too slowly.
Shadowing may also appear around stationary text or images.
If the problem only happens while objects move across the screen, read our guide to monitor ghosting.
If shadows remain visible around static objects, other causes may be involved.
02
Check the display cable
Start by checking HDMI, DisplayPort or USB-C connections.
Disconnect the cable and reconnect it securely.
If the problem continues, test another high-quality cable.
Signal problems are particularly worth investigating when the shadow appears offset horizontally from the original image.
03
Use the native resolution
A monitor generally looks sharpest at its native resolution.
Using a lower or unusual resolution requires the monitor to scale the image.
This can make text and graphics appear soft or create outlines that resemble shadows.
Open display settings and select the recommended resolution.
Our guide to computer monitor resolution explains why native resolution matters.
04
Check the monitor sharpness setting
Excessive sharpness can create artificial halos or outlines around objects.
Open the monitor's on-screen menu and return sharpness to a neutral or default value.
Do not assume that increasing sharpness always makes the picture clearer.
Too much digital sharpening can make image quality worse.
05
Adjust response-time settings
If shadowing appears mostly during movement, test the monitor's response-time or overdrive setting.
Increasing overdrive may reduce trailing.
However, excessive overdrive can create inverse ghosting, producing bright halos around moving objects.
Medium settings often provide the best balance.
06
Test another device
Connect the monitor to another computer or console.
If the shadowing remains, the monitor or cable is more likely to be responsible.
If it disappears, investigate your computer's graphics output and settings.
07
Check graphics settings
Some GPU settings can affect image scaling, color or sharpening.
Return unusual custom display settings to their defaults and test again.
Updating or reinstalling graphics drivers may also help if the issue started after a software change.
08
Could the monitor be failing?
Hardware problems are possible.
If the same shadowing appears with different cables and computers and is visible across every input, the display electronics or panel may be responsible.
If replacement becomes necessary, compare our computer monitor recommendations.
09
Practical checks before you continue
Start by describing the mark precisely. A trail that follows moving objects suggests motion ghosting; a faint stationary menu may be image retention; a duplicate edge that appears everywhere can point to the signal or sharpness processing. Photograph the screen and note whether the artifact moves with the content.
Open the monitor menu or disconnect the video cable. If the shadow appears in the built-in menu or no-signal box, the monitor is implicated. If it disappears, test another cable, port and computer at the display’s native resolution. Our guide to lines on a monitor covers related signal checks.
For moving trails, reset overdrive to its normal setting and confirm refresh rate. The fastest overdrive option can create bright inverse trails, especially at lower frame rates. Compare examples in our monitor ghosting guide, changing only one display setting at a time.
Do not press, heat or massage an LCD panel to remove a shadow. Run only the panel-care routine provided by the manufacturer. If a persistent mark remains across inputs and the monitor menu, record the serial number and warranty status before arranging service or comparing a replacement home-office monitor.
Allow the monitor to reach normal operating temperature before comparing test results, since some panel response characteristics change slightly after a cold start.
Sources and further reading
We use primary and specialist sources to check the principles in this article. Product recommendations are researched separately.
