HP ENVY TouchSmart 4-1200 User Manual page 60

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, select Power, and then select Shut Down.
●
Press and hold the power button for at least 5 seconds.
●
Disconnect the computer from external power.
50 Chapter 6 Managing power