737-370: Troubleshooting Common DVI Flat Panel Display Issues

Article Number: 370

This document outlines common display issues, which may occur when using DVI Flat Panels, and the steps that can be taken to try and resolve them.

In some instances, when using a DVI Flat Panel, you may experience one or more of the following symptoms:

  • No video or black screen before Windows loads
  • Incorrect size of text while the system starts
  • Monitor may report an incorrect display mode
  • Scrambled or blinking video within Windows
  • Horizontal lines or artifacts in the display

Each of these symptoms is a cause of a variety of reasons. The following are the most common sources:

  • Issue with the panel's connection to the graphics card
  • Incorrect monitor type selected in Windows
  • Refresh rate too high/incorrect
  • Selected display resolution exceeds panel's capabilities
  • Unsupported graphics card configuration
  • Issue with the system BIOS or its configuration
  • Conflict with USB support from motherboard

Issue with the panel's connection to the graphics card

A loose connection between the graphics card and the panel may allow several of the above symptoms to occur. Please ensure that the connection between the panel and card is secure.

Additionally, the use of a video dongle, adapter, or extension cable may cause display artifacts or horizontal lines in some circumstances. If you are using one of these to connect the panel to the graphics card, please try removing it and connecting the panel directly to the DVI port on the graphics card.

Some DVI Flat Panels will offer both DVI (digital) and VGA (analog) connections. For these panels, please try testing both connections using the panel's native resolution, as the quality of the display you receive may vary depending on the connection used. If the graphics card provides an available VGA port, this port can be tested as well.

NOTE: The use of an analog connection to the DVI connector on the graphics card may require the use of an adapter depending on the monitor cables provided with the panel.

Incorrect monitor type selected in Windows

An incorrect monitor type selection may cause several different symptoms including an incorrectly sized/positioned display, the display going blank, or a scrambled display.

Please check the Device Manager or Display Properties to determine what monitor Windows is currently configured for. If this selection does not match the actual flat panel being used, you may wish to change the selection to one which matches the panel in use. In many instances, the panel manufacturer may offer a special driver file for the panel which may help alleviate these symptoms within Windows.

Refresh rate is too high/incorrect

Many DVI display issues can be caused by using a refresh rate which is too high or incorrect for the display being used. Try lowering the refresh rate in the Windows Display Properties panel to see if this is the source.

If the panel offers more than one frequency, choose the lowest frequency supported first to ensure that the display functions correctly. When performing this test, please ensure that the panel controls are set to its factory default settings.

Selected display resolution exceeds panel's capabilities

In some instances, the selected resolution may be exceeding the capabilities of the DVI Flat Panel. In this case, the panel may not sync correctly, resulting in distortion of video or no video at all. Try lowering the display resolution to determine if this is the source of the problem.

Unsupported graphics card configuration

If an unsupported graphics card configuration is used, you may experience display problems when using a DVI Flat Panel.

For example, some graphics boards do not support multiple adapter configurations. ATI does not support the use of an additional PCI graphic card in a system with graphics adapters based on the RADEON VE/RADEON 7000/RADEON 7500/RADEON 8500 chipsets.

Installing the latest display driver is recommended. Current drivers for most ATI Products are available for download from our website.

Issue with the system BIOS or its configuration

In some instances, an updated system BIOS or altering the Plug & Play (PnP) settings in the BIOS may be required to allow the graphics card's BIOS to initialize correctly for support of DVI Flat Panels. Please check by doing the following:

  • Ensure that you have the latest system BIOS for your motherboard. 
  • Toggle the PnP aware OS option in your system BIOS from yes to no.

Conflict with USB support from motherboard

In some instances, the graphics card's own BIOS may not initialize correctly due to how USB support is implemented by the system. When this occurs, the card may not be able to correctly support DVI panels, especially under DOS. Please try the following:

  • Disable all USB support in the CMOS SETUP and retest.
  • Disable LEGACY USB support in the BIOS and retest.
  • If you are using a USB keyboard or mouse, please try testing with a PS2 style keyboard and mouse.