HP ProBook 6465b Notebook-PC - Manual (Page 100)

screen or the external display, or on both devices simultaneously. When you press fn+f4
repeatedly, the image alternates among the 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 by selecting Computer
> Shutdown > Restart. If you cannot restart the computer using this procedure, refer to the next
section,
The computer is on but not responding on page 90 .
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:
CAUTION: Emergency shutdown procedures result in the loss of unsaved information.
● 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.
WARNING! To reduce the possibility of heat-related injuries or of overheating the computer, do not
place 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).
NOTE: 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.
90 Appendix A Troubleshooting and support