Dell Latitude D531 (Mid 2007) - Manual (Page 90)

90 Troubleshooting
Fill out the Diagnostics Checklist (see "Diagnostics Checklist" on page 139) as you perform the various
checks.
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 H E C K T H E K E YB O A R D C A B L E — 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 H E C K T H E E X T ER N A L KE Y BOA RD
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 V E RI F Y T H A T T H E P R O B L E M I S WIT H T H E E X T E RN A L KE Y BOA RD , C H E CK T H E I N T E G RA T E D K E YBO A RD
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 138).
R U N TH E KE Y BOA RD D I A G N O S TI CS T E S T S — Run the PC-AT Compatible Keyboards tests in the Dell Diagnostics
(see "Dell Diagnostics" on page 79). If the tests indicate a defective external keyboard, contact Dell (see "Contacting
Dell" on page 138 ).
Unexpected characters
D I SA B L E T H E N U ME R I C K E YP A D — 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.