Applicable Models

IMPORTANT: This file is only for use with the models identified. Not all models are sold in all countries.

This information is for the following models:

  • HMD-A400

About this download

Benefits and improvements

This utility is a self-extracting file that contains the monitor .INF files.

System Requirements

Operating Systems

  • Windows® 2000
  • Windows® 95
  • Windows® 98/98SE
  • Windows® Me

File Info

File Name

  • A400.EXE

File Version

  • N/A

File Size

  • 0.07 MB

Release Date

  • 10-10-2003

Before You Start


Important Notes
  • A blank 3½ formatted floppy disk is required for this procedure.
  • To ensure that no other program interferes with the installation, save all work and close all other programs. The Taskbar should be clear of applications before proceeding.
  • It is highly recommended to print out these instructions as a reference during the installation process.

Download & Install


Download and Installation Instructions
  1. Download the A400.EXE file to a temporary or download directory (please note this directory for reference).
  2. Insert a blank formatted floppy disk into the computers floppy drive.
  3. Go to the directory where the file was downloaded and double-click A400.EXE.
  4. At the "HMD-A400 Information File" box, leave the "A:\" entry, and click the OK button. The .INF files for all three operating systems will be extracted onto the floppy disk.
  5. Leave the floppy disk in the drive.

The monitor INF files are now located on the floppy disk. Follow the Installation Instructions steps below to install the INF file.

Installation Instructions

The remaining portion of this procedure details how to install a monitor INF file. These instructions are broken into sections based on operating system.

Section I. Micrsoft® Windows® 95/98 Operating Systems
Section II. Microsoft® Windows® 98SE Operating System
Section III. Microsoft® Windows® Millennium Edition (Me) Operating System
Section IV. Microsoft® Windows® 2000 Operating System


Please proceed with the section below that pertains to your computer's operating system.

Section I. Microsoft Windows 95 Operating System

  1. Click Start, point to Settings, and click Control Panel.
  2. At the "Control Panel" window, double-click the Display icon.
  3. At the "Display Properties" window, click the Settings tab.
  4. In the Settings tab, click the Advanced Properties button.
  5. At the "Advanced Display Properties" window, click the Monitor tab.
  6. In the Monitor tab, click the Change button.
  7. At the Select Device box, click the Have Disk button.
  8. At the "Install From Disk" box, leave the "A:\" entry (which should designate your computer floppy drive) and click the Browse button.
  9. At the "Open" window, click to select the "Sonymon.inf" file, and click OK.
  10. At the "Install From Disk" box, click OK.
  11. At the "Select device" window, click to highlight the SONY HMD-A400 entry and click OK.
  12. At the "Display Properties" window, click Apply and OK. The screen may flicker and go dark for a moment.
  13. At the prompt, click Yes to keep the new setting.
  14. Click OK to close the "Advanced Display Properties" window.
  15. Click OK to exit the "Display Properties" window.
  16. Click the X in the top-right corner to close the "Control Panel" window.
  17. Remove the floppy disk from the drive.
    NOTE: If prompted, click OK or Yes to restart the computer. It is necessary to restart the computer in order for the new settings to take effect.
  18. Label the floppy disk "Sony HMD-A400 Monitor .INF Files," and store it for future use. This procedure will need to be repeated if your system is ever fully reinstalled.

Section II. Microsoft Windows 98 and Windows 98SE Operating Systems

  1. Click Start, point to Settings, and click Control Panel.
  2. At the "Control Panel" window, double-click the Display icon.
  3. At the "Display Properties" window, click the Settings tab.
  4. In the Settings tab, click the Advanced button.
  5. At the "graphics controller name Properties" window, click the Monitor tab.
  6. In the Monitor tab, click the Change button.
  7. At the "Update Device Wizard" box, click Next.
  8. At the "What do you want Windows to do?" screen, select "Display a list of drivers in a specific location..." and click Next.
  9. At the "Select the manufacturer and model of your hardware device..." screen, select "Show all hardware" and click the Have Disk button.
  10. At the "Install From Disk" box, leave the "A:\" entry (which should designate your computer floppy drive) and click the Browse button.
  11. At the "Open" window, click to select the "Sonymon.inf" file, and click OK.
  12. At the "Install From Disk" box, click OK.
  13. At the "Select the manufacturer and model of your hardware device..." screen, click to highlight the SONY HMD-A400 entry and click Next.
  14. At the "Windows driver search for file for device ..." screen, click Next.
  15. At the "Windows has finished installing the driver..." screen, click Finish.
  16. At the "Display Properties" window, click Apply and then click OK.
    NOTE: The screen may flicker and go dark for a moment. If prompted, click Yes to keep the new setting.
  17. Click OK to exit the "Display Properties" window.
  18. Click the X in the top-right corner to close the "Control Panel" window.
  19. Remove the floppy disk from the drive.
    NOTE: If prompted, click OK or Yes to restart the computer. It is necessary to restart the computer in order for the new settings to take effect.
  20. Label the floppy disk "Sony HMD-A400/L Monitor .INF Files," and store it for future use. This procedure will need to be repeated if your system is ever fully reinstalled.

Section III. Microsoft Windows Millennium Edition (Me) Operating System
  1. Click Start, point to Settings, and click Control Panel.
  2. At the "Control Panel" window, double-click the Display icon.
  3. At the "Display Properties" window, click the Settings tab.
  4. In the Settings tab, click the Advanced button.
  5. At the "graphics controller name Properties" window, click the Monitor tab.
  6. In the Monitor tab, click the Change button.
  7. At "Select Device" box, click the Have Disk button.
  8. At the "Install From Disk" box, leave the "A:\" entry (which should designate your system floppy drive) and click the Browse button.
  9. At the "Open" window, double-click the WinME folder.
  10. Double-click the "hmd-a200.inf" entry under File name.
  11. Click the OK button.
  12. At the "Install From Disk" box, click OK.
  13. At "Select Device" box, click to highlight "SONY HMD-A400" and click OK. Windows Me will automatically load the file.
  14. At the "graphics controller name Properties" window, click Apply and then click OK.
  15. Click OK to close the "Display Properties" window.
  16. Remove the floppy disk from the drive.
    NOTE: If prompted, click OK or Yes to restart the computer. It is necessary to restart the computer in order for the new settings to take effect.
  17. Label the floppy disk "Sony HMD-A400 Monitor .INF Files," and store it for future use. This procedure will need to be repeated if your system is ever fully reinstalled.

Section IV. Microsoft Windows 2000 Operating System

The procedure below requires that you be logged into Windows 2000 using a user account with administrator rights.
  1. Click Start, point to Settings, point to Control Panel, and click Display.
  2. At the "Display Properties" window, click the Settings tab.
  3. In the Settings tab, click the Advanced button.
  4. At the "graphics controller name Properties" box, click the Monitor tab.
  5. Under "Monitor Type," click the Properties button.
  6. At the "monitor name Properties" box, click the Driver tab.
  7. Click the Update Driver button.
  8. At the "Upgrade Device Driver Wizard" box, click Next.
  9. At the "Install Hardware Device Drivers" screen, select "Display a list of known drivers..." and click Next.
  10. At the "Select a Device Driver" screen, click the Have Disk button.
  11. At the "Install From Disk" box, leave the "A:\" entry (which should designate your system floppy drive) and click the Browse button.
  12. At the "Locate File" box, next to "Look in," click the DOWN ARROW button and select "3½ Floppy (A:)."
  13. Double-click the "Snymon31.inf" entry under File name.
  14. Click the Open button.
  15. At the "Install From Disk" box, click OK.
  16. At the "Upgrade Device Driver Wizard" screen, click to highlight the SONY HMD-A400 entry and then click Next.
  17. At the "Completing the Upgrade Device Driver Wizard" screen, click the Finish button.
  18. At the "monitor name Properties" window, click Close.
  19. At the "graphics controller name Properties" window, click OK.
  20. At the "Display Properties" window, click OK.
  21. Remove the floppy disk from the drive.
    NOTE: If prompted, click OK or Yes to restart the computer. It is necessary to restart the computer in order for the new settings to take effect.
  22. Label the floppy disk "Sony HMD-A400 Monitor .INF Files," and store it for future use. This procedure will need to be repeated if your system is ever fully reinstalled.