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Resolving Problems When Toggling Between Display Modes Using FN+F4

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This document pertains to HP Notebook PCs with Windows Vista.

Identifying display problems when toggling between display modes using fn+F4 keys

You may experience problems toggling between displays using the fn+F4 function key combination.
The limitations of both NVIDIA and ATI video chips may cause any of the following related issues :
  • Cannot change display mode from LCD to TV using the fn+F4 function key combination.
  • Windows Media Player display is black after pressing fn+F4.
  • Cannot switch display mode in full screen Media Center.
  • Blue screen error when toggling video display during WinDVD playback with an ATI video-based notebook.

Resolving display issues by updating the graphics drivers

The graphics driver is a program that allows the display to communicate with the Windows operating system. Updating your graphics driver can improve overall performance and fix many problems - including using the fn+F4 key combination to toggle between displays.
To determine if you need to update your graphics driver, you will need to compare the version number of the graphics driver that is installed on your PC against the version number of the latest available graphics driver on the HP Web site. You should always download and install the driver with the highest version number.
NOTE:The graphics drivers for different notebook models have different version numbers.
For more detailed information about how to download and install the latest graphics driver for your video card from the HP Web site, refer to Downloading and installing the latest driver from the HP web site .

Determine the version of the graphics driver installed on your PC

To view information on the graphics driver version that is installed on your PC, follow the steps below:
  1. Click Start, then click Control Panel.
  2. Click System and Maintenance.
  3. Click System.
  4. Click Device Manager under Tasks on the left side of the screen.
  5. If prompted for permission by the User Account Control pop-up window, click Continue.
  6. Click the plus sign (+) next to Display adapters.
  7. Double-click the appropriate display adapter for your video card.
  8. On the Driver tab, you can view information about the driver provider, driver date, and driver version.

Determine the version of the graphics driver on the HP web site

To view information on the graphics driver version available on the HP Web site, follow the steps below:
  1. Open a browser and go to the Software & Driver downloads page on the HP web site.
  2. Enter the Model Number of your notebook in the for product field, and click the start search icon.
  3. Select the current operating system to display a list of drivers.
  4. Locate the correct graphic driver and view information about the driver release date, and driver version.
If the version number and release date of the driver on the web site are later than the version of the driver on the notebook, you should download and install the latest driver.

Downloading and installing the latest graphics driver from the HP Web site

To download and install the latest graphics driver for your PC, follow the steps below:
  1. Open a browser and go to the Software & Driver downloads page.
  2. Type the PC's model number in the search field and then press Enter.
  3. When prompted, select the specific product from the models listed.
  4. When prompted, select the proper operating system.
  5. View the list of drivers, and click the desired driver to open a window with additional information.
    • To install the updated driver without downloading the file, click the Install now option. This option is not always available.
      Follow the prompts to install the driver.
    • To save the file to your PC for installation at another time, click the Download only option. When prompted, select Save, and then select a storage location on your hard drive.
  6. After the file is downloaded, navigate to the folder where the file was saved and double-click the file to begin the installation.
When the updated driver is installed, press the fn+F4 function key combination to see if updating the graphics driver resolves the problem.

What to do if updating the graphics driver does not fix the problem

If the problem of toggling between displays using the fn+F4 keys persists after you have downloaded and installed the latest graphics driver, try the following solutions:
  • Switch to the desired display before starting the presentation or CD/DVD video application
    This includes, but is not limited to the following:
    • If you are in Windows Media Player or Windows Media Center, switch to windowed mode (not full screen mode).
    • If you are watching a DVD, stop playing the DVD or HDDVD.
    • If you are using HP QuickPlay, close HP Quickplay.
    • If you are playing a game, stop playing the game that you are playing and/or close the game.
  • If the problem still persists when viewing the presentation or video in full-screen mode, switch to windowed mode to reduce the demands on the video chip.
The fn+F4 function key combination or the NVIDIA control panel should now toggle between displays. Closing all applications before toggling between displays should avoid this issue. If no Direct 3D software is running, the toggle displays function should operate as expected.
For best results, you should also download and install the latest BIOS driver.

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