Dell Precision M40 User Manual page 76

1. Press the <Num Lk>, <Scroll Lk>, and <Caps Lock> keys.
, , and Lights
2. If their lights do not light, run the PC-AT Compatible Keyboards tests in the
Don't Light Up
External Keyboard Basic Checks:
Doesn't Work
l
When you attach an
external keyboard, the
l
integrated keyboard remains
l
fully functional. During
l
POST, the computer checks
whether an external
If the problem still exists after you complete the basic checks, fill out the
keyboard is connected; if it
following steps:
is, the computer recognizes
both the integrated keyboard
and the external keyboard.
1. Turn off the computer, and then remove the keyboard cable and check it for bent or broken pins.
Use the integrated keyboard:
when working in MS-
l
DOS mode
when running the Dell
l
Diagnostics
2. Reconnect the keyboard to the computer.
when using the
l
3. Make sure the cable from the external keyboard is firmly connected to the keyboard/mouse connector on the
system setup
program
4. Turn on the computer.
5. If you are using a keyboard that can be configured with various switch settings, make sure the switch is set to
6. Turn off the computer, wait one minute, and then turn it on again. During the boot routine, do the Num Lock,
7. Does the computer recognize the external keyboard?
8. Turn off the computer and disconnect the external keyboard from the computer.
9. Turn on the computer. Does the computer recognize the integrated keyboard?
10.
Devices Attached to Basic Checks for All Devices:
Serial or Parallel Ports
Don't Work
l
l
If you are having a
problem with a printer,
see "Parallel Port Printer
Basic Checks for Serial Device:
Doesn't Work."
1. Exit any open application programs, and then turn off the computer and the serial device.
If a system error message
2. Swap the device's cable with a known working cable.
indicates a port problem or if
3. Turn on the computer and the serial device.
equipment connected to a
port seems to perform
incorrectly or not at all, the
source of the problem may
Disconnect the keyboard cable from the computer and check the cable connector for bent or broken pins.
Check for damaged or frayed cables.
Check for interference. Keyboard extension cables can cause problems
Run the PC-AT Compatible Keyboards tests as described in
Restart the computer.
Yes. If you see bent pins and they can be straightened, straighten them and go to step 2. If they cannot be
straightened, or are broken, you need a new keyboard.
No. Go to step 2.
back of the computer.
PS/2, Enhanced XT/AT, or PC/AT.
The switch settings are usually on the bottom of the keyboard, sometimes behind a panel tab. Refer to the
documentation that came with the keyboard for more information.
Caps Lock, and Scroll Lock lights on the external keyboard blink momentarily?
Yes. Go to step 7.
No. You may have a defective keyboard. Go to step 10.
Use the external keyboard to type some characters. Do they appear on the display?
Yes. The problem is resolved.
No. Go to step 8.
Allow one minute for the computer to initialize its components. Then use the computer's integrated
keyboard to type some characters. Do the characters appear on the display?
Yes. The external keyboard may be defective. Run the PC-AT Compatible Keyboards device group in
the Dell Diagnostics. If you cannot isolate the problem after running the diagnostics,
assistance.
No. Go to step 10.
Call Dell for technical assistance.
Make sure that the device's cable is firmly connected to its connector on the computer.
Test the electrical outlet. Verify that the device is connected to a working electrical outlet. Verify that the device
is on.
Is the problem resolved?
Dell Diagnostics.
"Dell Diagnostics."
Diagnostics Checklist as you perform the
call Dell for technical