Solving Problems 49Keyboard ProblemsCAUTION: Before you begin any of the procedures in this section, follow the safety instructions in theProduct Information Guide.NOTE: Use the integrated keyboard when working in MS-DOS® mode or when running theDell Diagnostics or the system setup program. When you attach an external keyboard, the integratedkeyboard remains fully functional.External Keyboard ProblemsNOTE: When you attach an external keyboard, the integrated keyboard remains fully functional.A R E Q U I R E D .DLL F I L E W A S N O T F O U N D — The program that you are trying to open is missing anessential file. Remove and then reinstall the program.1 Click the Start button and click Control Panel.2 Click Add or Remove Programs.3 Select the program you want to remove.4 Click Remove or Change/Remove and follow the prompts on the screen.5 See the program documentation for installation instructions.<D R I V E L E T T E R >:\ I S N O T A C C E S S I B L E . TH E D E V I C E I S N O T R E A D Y — Insert a disk into the driveand try again.CH E C K T H E K E Y B O A R D C A B L E — Shut down the computer. Disconnect the keyboard cable and checkit for damage, and firmly reconnect the cable.If you are using a keyboard extension cable, disconnect it and connect the keyboard directly tothe computer.CH E C K T H E E X T E R N A L K E Y B O A R D —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 the Start button, point to Programs, point to Accessories, andclick 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.