HP EliteBook 2740p User Guide - Windows Vista

If the computer is unresponsive and you are unable to use the preceding shutdown procedures, try
the following emergency procedures in the sequence provided:
●
Press ctrl+alt+delete, and then click the Power button.
●
Slide and hold the power switch for at least 5 seconds.
●
Disconnect the computer from external power and remove the battery.
82 Chapter 6 Power management