This document applies to HP and Compaq desktop computers with Windows Vista.
Pressing the Sleep key on the keyboard or clicking the Sleep button from the Windows Vista start menu should cause the computer to enter a lower power state. In this state, the computer screen should go blank and the power light on the front of the computer should blink. This saves power while the computer is not in use.
To wake the computer, move the mouse, press the sleep button on the keyboard or press the power button on the front of the computer.
Figure : Sleep/Standby button in Windows Vista
Figure : Sleep button on keyboard
If the computer wakes from sleep mode unexpectedly, if pressing the sleep button on the keyboard or clicking the Sleep/Standby button in the Start menu does not put the computer into a lower power state, or if pressing the sleep button on the keyboard does not wake the computer, use this document to help resolve the problem.
note:If the sleep key on the keyboard fails to wake the computer, pressing the blinking power button on the front of the computer will usually work.