Troubleshooting Memory; Troubleshooting The Built-In Display - Dell Latitude LM Reference And Troubleshooting Manual

keyboard to type some characters. Do the characters
appear on the display?
Yes. The external keyboard may be defective. Run
the Keyboard Test Group in the Dell diagnostics. If
you cannot isolate the problem after running the
diagnostics, call Dell for technical assistance.
No. Go to step 7.
7. Call Dell for technical assistance.
See Chapter 5, "Getting Help," for instructions.

Troubleshooting Memory

During POST, the computer checks the computer's mem-
ory, and then writes to and reads from the number of
available bytes to ensure proper operation. If the memory
count displayed is less than the amount installed, make a
copy of the Diagnostics Checklist found in Chapter 5 and
fill it out as you complete the following procedure:
1. Reboot the computer. Does the random-access
memory (RAM) count displayed correctly match
the actual amount of memory installed in the
computer?
Yes. The computer needed to update the memory; the
memory check phase is OK now.
No. Go to step 2.
2. Reseat (remove and reinstall) any installed mem-
ory modules in your computer.
A loose or disconnected memory module may cause
intermittent memory problems. Removing and re-
installing, or reseating, a memory module often
corrects the problem.
To remove a memory module, carefully spread apart
the inner metal tabs of memory module socket just
far enough for the memory module to disengage
from the socket (the module should pop up slightly).
Then lift the memory module away from the socket.
To reinstall a memory module, align the memory
module's edge connector with the slot in the center
of the memory module socket. Press the memory
module's edge connector firmly into the socket.
Pivot the module down until it clicks into place. If
you do not hear a sharp click, remove the memory
module and reinstall it.
3. Reboot the computer. Does the RAM count
complete?
Yes. A memory module was loose; the memory
check phase is OK now.
No. Go to step 4.
4. Call Dell for technical assistance.
See Chapter 5, "Getting Help," for instructions.

Troubleshooting the Built-In Display

If the computer is receiving power, but nothing appears
on your display (such as light, text, or graphics) or the
display image does not appear as you would expect,
make a copy of the Diagnostics Checklist found in Chap-
ter 5 and fill it out as you complete the following
procedure.
NOTE: The highest video resolution supported by your
built-in display is 800 x 600 pixels. If your application
program uses a higher resolution, you must attach an
external video graphics array (VGA) monitor to your
computer.
1. If the computer is running, press any key on the
built-in keyboard. Is the full display readable?
Yes. The computer was in standby or suspend mode.
The problem is resolved.
No. Go to step 2.
2. Is an external monitor connected to the
computer?
Yes. Go to step 3.
No. Go to step 4.
3. Press the < >< > key combination. Is the full
FN F8
display readable?
Yes. The Video Mode option in the Setup program
was set to
CRT MODE
No. Go to step 4.
4. Turn off the computer and any attached periph-
erals. Disconnect all peripherals from the
computer.
5. Make sure the AC adapter is firmly connected to
the computer and to an AC power source, or ver-
ify that a fully charged battery is properly seated
in its compartment.
Troubleshooting Your Computer
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