HP EliteBook 2560p User Manual page 82

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