Dell Precision M4300 (Mid 2007) - Manual (Page 86)

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Troubleshooting
NOTE:
Use the integrated keyboard when running the Dell Diagnostics or the system setup program. When you
attach an external keyboard, the integrated keyboard remains fully functional.
External keyboard problems
NOTE:
When you attach an external keyboard, the integrated keyboard remains fully functional.
C HECK THE KEYBOARD CABLE — Shut down the computer. Disconnect the keyboard cable and check it for
damage, and firmly reconnect the cable.
If you are using a keyboard extension cable, disconnect it and connect the keyboard directly to the
computer.
C HECK THE EXTERNAL KEYBOARD —
1 Shut down the computer, wait 1 minute, and turn it on again.
2 Verify that the numbers, capitals, and scroll lock lights on the keyboard blink during the boot routine.
3 From the Windows desktop, click Start→ All Programs→ Accessories→ Notepad.
4 Type some characters on the external keyboard and verify that they appear on the display.
If you cannot verify these steps, you may have a defective external keyboard.
T O VERIFY THAT THE PROBLEM IS WITH THE EXTERNAL KEYBOARD , CHECK THE INTEGRATED KEYBOARD —
1 Shut down the computer.
2 Disconnect the external keyboard.
3 Turn on the computer.
4 From the Windows desktop, click Start→ All Programs→ Accessories→ Notepad.
5 Type some characters on the internal keyboard and verify that they appear on the display.
If the characters appear now but did not with the external keyboard, you may have a defective external
keyboard. Contact Dell (see
"Contacting Dell" on page 142 ).
R UN THE KEYBOARD DIAGNOSTICS TESTS — Run the PC-AT Compatible Keyboards tests in the Dell Diagnostics
(see "Dell Diagnostics" on page 73). If the tests indicate a defective external keyboard, contact Dell (see "Contacting
Dell" on page 142 ).
Unexpected characters
D ISABLE THE NUMERIC KEYPAD — Press to disable the numeric keypad if numbers are displayed
instead of letters. Verify that the numbers lock light is not lit.
Lockups and Software Problems
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the Product
Information Guide.