When this reader was struggling with his Samsung T220, our Helproom Editor was happy to help
QUESTION I've been experiencing problems with my Samsung T220 display in analogue mode. The image is wavy at the borders and flickering. My son advised me to use a DVI cable, but when I plug it in I just see my desktop background, with no Windows icons or mouse cursor. The display still flickers – might it be on the way out?
HELPROOM ANSWER From your description, it sounds as though you've connected the DVI-D cable at the same time as the VGA cable. This will result in the PC detecting a single monitor as two displays. The desktop you're seeing without your icons is what would be displayed on the second monitor in a dual-screen setup.
Try booting the PC with only the DVI-D cable connected. It's likely that the DVI-D connection will give you a better-quality picture than VGA.
However, the flickering does indeed suggest a problem with the monitor, and you may need to replace it.
Alternatively, it could be a problem with your graphics card, but you would typically notice graphical corruption as well as flickering.