126 TroubleshootingAD J U S T T H E WI N D O W S D I S P L A Y S E T T I N G S —1 Click Start → Control Panel→ Appearance and Personalization→Personalization→ Display Settings.2 Click the area you want to change or click the Display icon.Try different settings for Resolution and Colors.RU N T H E VI D E O D I A G N O S T I C S T E S T S — If no error message appears and youstill have a display problem, but the display is not completely blank, run theVideo device group in the "Dell Diagnostics" on page 99, then contact Dell(see "Contacting Dell" on page 179).SE E "ER R O R ME S S A G E S " — If an error message appears, see "Error Messages"on page 108.If only part of the display is readableCO N N E C T A N E X T E R N A L M O N I T O R —1 Shut down your computer and connect an external monitor to thecomputer.2 Turn on the computer and the monitor, and then adjust the monitorbrightness and contrast controls.If the external monitor works, the computer display or video controllermay be defective. Contact Dell (see "Contacting Dell" on page 179).DriversWhat Is a Driver?A driver is a program that controls a device such as a printer, mouse, orkeyboard. All devices require a driver program.A driver acts like a translator between the device and any other programs thatuse the device. Each device has its own set of specialized commands that onlyits driver recognizes.Dell ships your computer to you with required drivers already installed—nofurther installation or configuration is needed.NOTICE: Your Drivers and Utilities media may contain drivers for operating systemsthat are not on your computer. Ensure that you are installing software appropriatefor your operating system.
