Sony VGN-BX740 User Guide (Microsoft® Windows® XP) User Manual page 191

On models with the ATI video controller, you may find your computer screen temporarily goes blank:
When you connect or disconnect the AC adapter
Immediately after you start the computer with battery power
To save your preference for the brightness, follow these steps:
1 Click Start and then Control Panel.
2 Click Performance and Maintenance.
3 Click Power Options.
4 Select the VAIO Power Management tab.
5 Select Off for LCD Power-saving mode of both Plugged in and Running on batteries.
6 Click OK.
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Troubleshooting