Dell PP22L manual Drivers, If only part of the display is readable, What Is a Driver?, 139

R U 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 you still have a display problem, but the display is not completely blank, run the Video device group in the "Dell Diagnostics" on page 107, then contact Dell (see "Contacting Dell" on page 192).

S E E "E R R O R M E S S A G E S " — If an error message appears, see "Error Messages" on page 119.

If only part of the display is readable

C O N N E C T A N E X T E R N A L M O N I T O R —

1Shut down your computer and connect an external monitor to the computer.

2Turn on the computer and the monitor, and then adjust the monitor brightness and contrast controls.

If the external monitor works, the computer display or video controller may be defective. Contact Dell (see "Contacting Dell" on page 192).

Drivers

What Is a Driver?

A driver is a program that controls a device such as a printer, mouse, or keyboard. All devices require a driver program.

A driver acts like a translator between the device and any other programs that use the device. Each device has its own set of specialized commands that only its driver recognizes.

Dell ships your computer to you with required drivers already installed—no further installation or configuration is needed.

NOTICE: Your Drivers and Utilities media may contain drivers for operating systems that are not on your computer. Ensure that you are installing software appropriate for your operating system.

Many drivers, such as the keyboard driver, come with your Microsoft® Windows® operating system. You may need to install drivers if you:

•Upgrade your operating system.

•Reinstall your operating system.

•Connect or install a new device.

Troubleshooting

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