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  • Information
    Important Print Security Update

    HP was recently made aware of a vulnerability in certain inkjet printers by a third-party researcher. HP has updates available for download to address the vulnerability. Details and more information are available in the Security Bulletin

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HP and Compaq Desktop PCs - Using Two or More Monitors with One Computer (Windows Vista)

This document applies to HP and Compaq Desktop computers with more than one video output connector using Windows Vista
This document explains how to connect and set up a television (TV) or a monitor as a second display.
Before you begin
Make sure the computer has at least two video connections: one for the main monitor and one for the secondary monitor or TV. Many HP and Compaq Desktop computers are already come equipped with two video connections.
  note:
If you must add a second video card to your computer to gain another video connection, make sure both video cards use the same Windows Vista compliant (WDDM) driver. One way to ensure this is to use the same video card model for both video connections.
Connect the second display
To connect your TV or second monitor as a second display, do the following:
Select the type of connection you want to use
The latest computers and TVs offer a wide variety of video connection options. The video connection on your computer must match the video connection on your TV or monitor. Select the connection type from the table below that meets your needs to make sure the correct cable is used.
  note:
In certain cases, such as when connecting DVI to HDMI, adaptors may be available for some video connections. Refer to the documentation that came with the TV or monitor.
Video connection types
Video Out connector/cable
Use with
Video (composite)
TV
S-video
TV
VGA
Monitor
DVI
Monitor or High Definition TV
HDMI
High Definition TV
A DVI-HDMI adaptor may be needed.
Connect the TV
  1. Connect the TV to the computer using the cable you have chosen.
  2. Connect the TV power and turn it on.
  3. Change the TV video input source to match the video source connection from the computer (Line-1, Video-1, HDMI, etc.). Refer to the documentation that came with the TV for instructions.
  4. Turn on the computer.
  note:
Depending on the TV, the image quality may not be as good as that of a monitor.
Connect the monitor
  1. Connect the monitor to the computer using the cable you have chosen.
  2. Connect the monitor power and turn it on.
  3. Turn on the computer.
Configure the display settings
The following are instructions to set up the two most common multiple display configurations:
Presentation or Clone: This displays the same (Clone) image on both displays. This configuration is most commonly used for presentations; that is, the presenter works from a smaller monitor while the audience views the presenter’s work from a larger TV, monitor, or projector.
Extending the desktop: The Windows desktop or work area extends across both displays. This configuration is most commonly used to get more workspace. People usually take advantage of the extra workspace to view different applications on different displays.
Presentation or clone
Configuring the display settings to presentation or clone may require special drivers. At the time this document was written, HP and Compaq computers are installed with ATI or NVIDIA video cards. You can refer to the following two procedure examples to learn how video technology software can be adjusted for a presentation environement:
  note:
If the video technology used on your computer is different than what is shown below and you are unable to find the setting for presentation mode, refer to the video technology manufacturer's website for more help and information.
Video card
Procedure
ATI
  1. Right-click an empty space on the Windows desktop, and select ATI Catalyst Control Center.
  2. Select Basic setup and click Go..
  3. Select Clone, and select the resolution.
  4. Click Finish.
NVIDIA
  1. Right-click an empty space on the Windows desktop, and select NVIDIA Control Panel.
  2. Click Display and click Change Display Configuration.
  3. Select Clone and click Apply.
Extending the desktop
Extend the desktop using Windows Vista Display Settings.
  1. Right-click an empty space on the desktop, and select Personalization.
  2. Click Display Settings. The Display Settings window displays.
    Figure : Display Settings
    Display Settings window showing monitor display options.
  3. Select the monitor representing your second display. Click the Extend the desktop onto this monitor checkbox and click OK.
      note:
    To help identify your monitors, click Identify Monitors. The numbers 1 or 2 are shown on the monitor icons to help you identify them.
  4. (Optional) To adjust the resolution, in the Display Settings window, select a monitor and slide the resolution slide bar. Click OK.
  5. (Optional) To change the direction the desktop will extend (left or right to match how the displays are physically set up), select a monitor and drag it to the desired position.
Troubleshooting TV setup
Try the following items if you encounter problems when trying to connect a TV to the computer:
  • Certain display adapters need to have TV set as the primary display adapter before it can be recognized at all. If the computer is not "detecting" the TV as a display device when the computer is turned on, set TV as the primary display device in Windows and restart the computer.
  • Turn on the TV before turning on the computer.
  • TVs require their source setting be changed to the video source that the video card is using. Select either Input 1, Input 2, or S-video by pressing the Source or Input Source button on the TV's remote control. This can vary depending on the type of TV you are using. If your TV does not have this capability, then you will not be able use it as a second monitor without using special video signal processing (not covered in this document). For more detailed instructions consult the manual for your TV.
  • Set the screen resolution to 800 x 600 or less from Display Properties on the computer.
  • Use only one video source. Do not connect two cables to the same TV or monitor.
  • A TV accepts either a PAL (Europe) or NTSC (North America) signal, depending on the country it was made for. Make sure that the signal format of the TV matches the signal output that the card produces (for on-board TV-output, this setting can be changed in the BIOS).

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