HP dx2810 - Microtower PC Service & Reference Manual page 150

Computer will not respond to USB keyboard or mouse.
Cause
System has locked up.
Keyboard or mouse is not connected to computer. Connect keyboard and mouse cables to
Computer is in standby mode.
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
Cause
The Num Lock
Poor performance is experienced.
Cause
Processor is hot.
Hard drive is full.
Low on memory.
140 Appendix C Troubleshooting
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key may be on.
Solution
Restart computer.
computer.
To resume from standby mode, press the power
button or press any key.
CAUTION:
standby mode, do not hold down the power
button for more than four seconds. Otherwise, the
computer will shut down and you will lose any
unsaved data.
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 for instructions on
installing a new battery, or contact an authorized
dealer or reseller for RTC battery replacement.
keys on the keypad.
Solution
Press the Num Lock
should not be on if you want to use the
The Num Lock
in Computer Setup.
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.
Add more memory.
When attempting to resume from
key. The Num Lock light
key can be disabled (or enabled)
arrow keys.