Sony PCV-RXP-RZP - Manual (Page 31)

Configuring Your System 17
Changing Power Management Settings
Power Management capability is designed to enable your computer to
reduce power or shut itself off after being idle for a specified period of
time.
1
From the Start menu, point to Settings, click Control Panel, then
click Display.
The Power Options Properties dialog box opens, with the Power
Schemes tab displayed.