HP ProOne 400 Maintenance & Service Guide - Page 98

Troubleshooting without diagnostics, Control Panel

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Computer date and time display is incorrect. Cause Solution RTC (real-time clock) battery may need to be replaced. NOTE: Connecting the computer to a live AC outlet prolongs the life of the RTC battery. Reset the date and time under Control Panel (Computer Setup can also be used to update the RTC date and time). If the problem persists, replace the RTC battery. See the Removal and Replacement section for instructions on installing a new battery, or contact an authorized dealer or reseller for RTC battery replacement. To access Control Panel in Windows 7, select Start, and then select Control Panel. To access Control Panel in Windows 8.1, from the Start screen, type c, and then select Control Panel from the list of applications. To access Control Panel in Windows 10, type control panel in the taskbar search box, and then select Control Panel. There is no sound or sound volume is too low. Cause System volume may be set low or muted. Solution 1. Check the Computer Setup settings to make sure the internal system speaker is not muted (this setting does not affect the external speakers). 2. Make sure the external speakers are properly connected and powered on and that the speakers' volume control is set correctly. 3. Use the system volume control available in the operating system to make sure the speakers are not muted or to increase the volume. Cannot remove computer cover or access panel. Cause Smart Cover Lock, featured on some computers, is locked. 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. Poor performance. Cause Processor is too hot. Solution 1. 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. 2. Make sure fans are connected and working properly (some fans only operate when needed). 88 Chapter 7 Troubleshooting without diagnostics

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Computer date and time display is incorrect.
Cause
Solution
RTC (real-time clock) battery may need to be replaced.
NOTE:
Connecting the computer to a live AC outlet prolongs the
life of the RTC battery.
Reset the date and time under
Control Panel
(Computer Setup
can also be used to update the RTC date and time). If the problem
persists, replace the RTC battery. See the Removal and
Replacement section for instructions on installing a new battery,
or contact an authorized dealer or reseller for RTC battery
replacement.
To access Control Panel in Windows 7, select
Start
, and then
select
Control Panel
.
To access Control Panel in Windows 8.1, from the Start screen,
type
c
, and then select
Control Panel
from the list of
applications.
To access Control Panel in Windows 10, type
control panel
in
the taskbar search box, and then select Control Panel.
There is no sound or sound volume is too low.
Cause
Solution
System volume may be set low or muted.
1.
Check the Computer Setup settings to make sure the
internal system speaker is not muted (this setting does not
affect
the external speakers).
2.
Make sure the external speakers are properly connected and
powered on and that the speakers' volume control is set
correctly.
3.
Use the system volume control available in the operating
system to make sure the speakers are not muted or to
increase the volume.
Cannot remove computer cover or access panel.
Cause
Solution
Smart Cover Lock, featured on some computers, is locked.
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.
Poor performance.
Cause
Solution
Processor is too hot.
1.
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.
2.
Make sure fans are connected and working properly (some
fans only operate when needed).
88
Chapter 7
Troubleshooting without diagnostics