130 TroubleshootingT O V E R I F Y T H A T T H E P R O B L E M I S W I T H T H E E X T E R N A L K E Y B O A R D , C H E C K T H EI N T E G R A T E D K E Y B O A R D —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 appearon the display.If the characters appear now, but did not with the external keyboard, youmay have a defective external keyboard. Contact Dell (see "ContactingDell" on page 165).R U N T H E K E Y B O A R D D I A G N O S T I C S T E S T S — Run the PC-AT CompatibleKeyboards tests in the Dell Diagnostics (see "Dell Diagnostics" on page 111).If the tests indicate a defective external keyboard, contact Dell (see"Contacting Dell" on page 165).Unexpected charactersD I S A B L E T H E N U M E R I C K E Y P A D — Press to disable the numerickeypad if numbers are displayed instead of letters. Verify that the numberslock light is not lit.Lockups and Software ProblemsCAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in theProduct Information Guide.The computer does not startC H E C K T H E A C A D A P T E R — Ensure that the AC adapter is firmly connected tothe computer and to the electrical outlet.The AC adapter shuts down when there is a fault. The green light turns offwhen this happens. To bring it back on, disconnect the AC adapter from thepower source for 10 seconds, and then connect it back on.
