D–2
437963-001
Service Reference Guide, dc5750
Troubleshooting Without Diagnostics
Solving Minor Problems
Solving Minor Problems
Problem
Cause
Possible Solution
Computer appears
locked up and will not
turn off when the power
button is pressed.
Software control of the
power switch is not
functional.
1. Press and hold the power button
for at least four seconds until the
computer turns off.
2. Disconnect electrical plug from
outlet.
Computer will not
respond to USB
keyboard or mouse.
Computer is in
standby
mode.
Press the power button or press any
key to resume from
standby
mode.
Ä
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.
System has locked up.
Restart computer.
Computer date and
time display is incorrect.
RTC (real-time clock)
battery may need to be
replaced.
✎
Connecting the
computer to a live
AC outlet prolongs
the life of the RTC
battery.
1. Reset the date and time under
Control Panel
. Computer Setup
can also be used.
2. Replace the RTC battery.
Computer appears to
pause periodically.
Network driver is loaded
and no network
connection is established.
Establish a network connection, or
use Computer Setup or Microsoft
Windows Device Manager to disable
the network controller.
Cursor will not move
using the arrow keys on
the keypad.
The
Num Lock
key
may be on.
Press the
Num Lock
key. The
Num
Lock
key can be disabled (or
enabled) in Computer Setup.
There is no sound or
sound volume is too
low.
System volume may be set
too low or mute.
1. Check the F10 BIOS 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.
