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HP EliteBook 820 User Manual: Software Is Functioning Abnormally; The Computer Is On But Not Responding; The Computer Is Unusually Warm; An External Device Is Not Working

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connected to the computer, the image can be displayed on the computer screen or the external display,
or on both devices simultaneously. When you press
computer display, one or more external displays, and simultaneous display on all devices.

Software is functioning abnormally

If the software is unresponsive or responds abnormally, restart the computer. Click Start, click the arrow
next to Shut down, and then select Restart. If you cannot restart the computer using this procedure, see the
next section,

The computer is on but not responding

If the computer is turned on but is not responding to software or keyboard commands, try the following
emergency shutdown procedures, in the sequence provided, until shutdown occurs:
Press and hold the power button for at least 5 seconds.
Disconnect the computer from external power and remove the battery.

The computer is unusually warm

It is normal for the computer to feel warm to the touch while it is in use. But if the computer feels unusually
warm, it may be overheating because a vent is blocked.
If you suspect that the computer is overheating, allow the computer to cool to room temperature. Be sure to
keep all vents free from obstructions while you are using the computer.
the computer directly on your lap or obstruct the computer air vents. Use the computer only on a hard, flat
surface. Do not allow another hard surface, such as an adjoining optional printer, or a soft surface, such as
pillows or rugs or clothing, to block airflow. Also, do not allow the AC adapter to contact the skin or a soft
surface, such as pillows or rugs or clothing, during operation. The computer and the AC adapter comply with
the user-accessible surface temperature limits defined by the International Standard for Safety of
Information Technology Equipment (IEC 60950).
The fan in the computer starts up automatically to cool internal components and prevent
overheating. It is normal for the internal fan to cycle on and off during operation.

An external device is not working

Follow these suggestions if an external device does not function as expected:
Turn on the device according to the manufacturer's instructions.
Be sure that all device connections are secure.
Be sure that the device is receiving electrical power.
Be sure that the device, especially if it is older, is compatible with the operating system.
Be sure that the correct drivers are installed and updated.

The wireless network connection is not working

If a wireless network connection is not working as expected, follow these suggestions:
Appendix B Troubleshooting
The computer is on but not responding on page
Emergency shutdown procedures result in the loss of unsaved information.
To reduce the possibility of heat-related injuries or of overheating the computer, do not place
repeatedly, the image alternates among the


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