HP dx2290 - Microtower PC Service & Reference Manual page 82

Table D-1 Solving General Problems (continued)
Computer date and time display is incorrect.
Cause
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.
Cursor will not move using the arrow keys on the keypad.
Cause
The Num Lock
There is no sound or sound volume is too low.
Cause
System volume may be set low or muted.
The audio device may be connected to the wrong jack on the
rear of the computer or the jack has been retasked to perform
a different function.
Poor performance is experienced.
Cause
Processor is hot.
Hard drive is full.
74 Appendix D Troubleshooting Without Diagnostics
key may be on.
Solution
First, 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
Hardware Reference Guide on the Documentation and
Diagnostics CD for instructions on installing a new battery, or
contact an authorized dealer or reseller for RTC battery
replacement.
Solution
Press the Num Lock key. The Num Lock light should not be on
if you want to use the arrow
disabled (or enabled) in Computer Setup.
Solution
1. Make sure the external speakers are properly connected
and powered on and that the speakers' volume control is
set correctly.
2. Use the system volume control available in the operating
system to make sure the speakers are not muted or to
increase the volume.
Ensure that the device is connected to the correct jack on the
rear of the computer. If the correct jack is being used and the
problem persists, the jack may have been retasked to perform
a function that is different from the default function. Open the
Realtek control panel by clicking the Realtek HD Audio
Manager icon in the task tray or the Realtek entry in the
operating system's Control Panel and set the jack to the
desired function.
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).
3. Make sure the processor heatsink is installed properly.
Transfer data from the hard drive to create more space on the
hard drive.
keys. The Num Lock key can be