Dell UY691 Lockups and Software Problems

84 Troubleshooting
External keyboard problems
NOTE: When you attach an external keyboard, the integrated keyboard remains fully functional.
CHECK 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.
CHECK 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.
TO 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 page143).
RUN THE KEYBOARD DIAGNOSTICS TESTS —Run the PC-AT Compatible Keyboards tests in the Dell Diagnostics
(see "Dell Diagnostics" on page73). If the tests indicate a defective external keyboard, contact Dell (see
"Contacting
Dell" on page143
).
Unexpected characters
DISABLE THE NUMERIC KEYPAD —Press <Num Lk> 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.