HP ProOne 400 G1 Maintenance & Service Manual page 111

Cursor will not move using the
Cause
The Num Lock key is turned on.
There is no sound or sound volume is too low.
Cause
System volume may be set low or muted.
Cannot remove computer cover or rear cover.
Cause
Smart Cover Lock, featured on some computers, is locked.
Poor performance.
Cause
Processor is too hot.
Hard drive is full.
Low on memory.
arrow keys on the keypad.
Solution
Press the
want to use the
disable or enable the
Advanced > Device Options.
Solution
1.
2.
3.
Solution
Unlock the Smart Cover Lock using Computer Setup.
In case of forgotten password, power loss, or computer
malfunction, you must manually disable the Smart Cover lock .
A key to unlock the Smart Cover Lock is not available from
HP. Keys are typically available from a hardware store.
Solution
1.
2.
3.
Transfer data from the hard drive to create more space on the
hard drive.
Add more memory.
Num Lock key. The Num Lock light must be off if you
arrow keys on the keypad. You can also
Num Lock key in Computer Setup at
Check the Computer Setup settings to make sure the
internal system speaker is not muted (this setting does not
affect the external speakers).
Make sure the external speakers are properly connected
and powered on and that the speakers' volume control is
set correctly.
Use the system volume control available in the operating
system to make sure the speakers are not muted or to
increase the volume.
Make sure airflow to the computer is not blocked. Leave
a 10.2-cm (4-inch) clearance on all vented sides of the
computer and above the monitor to permit the required
airflow.
Make sure fans are connected and working properly
(some fans only operate when needed).
Make sure the processor heat sink is installed properly.
Solving General Problems
101