Troubleshooting Guide www.hp.com/in 8-13
Troubleshooting
Problem
Computer will not respond
to USB keyboard or mouse.
USB Keyboard does not
respond/work
Computer date and time
display is incorrect.
Cursor will not move using the
arrow keys on the keypad.
Poor performance is
experienced.
Cause
Computer is in
standby
mode.
Keyboard or mouse is not
connected to computer.
System has locked up.
System USB Keyboard
support is not enabled in the
F10 BIOS setup.
RTC (real-time clock) battery
may need to be replaced. .
MConnecting the
computer to a live AC
outlet prolongs the life of
the RTC battery.
The
Num Lock
key may be
on.
Processor is hot.
Solution
Press the power button to
resume from
standby
mode.
Connect keyboard and
mouse cables to computer.
Restart the computer.
Restart the computer and
press F10 to enter BIOS
setup. Enter into Integrated
peripherals and enable the
USB keyboard support.
First, reset the Date and Time
Properties in the
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.
Press the Num Lock key. The
Num Lock light should not be on
if you want to use the arrow
keys. The Num Lock key can be
disabled (or enabled) in
Computer Setup.
1. Ensure airflow to the
computer is not blocked.
Leave a 4-inch (10.2-cm)
clearance on all vented sides
of the computer and monitor
to permit required airflow.
2. Ensure fans are connected
and working properly (some
fans only operate when
needed).
3. Ensure the processor heatsink
is installed properly.
CAUTION:
When attempting to resume from
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.
!