142 TroubleshootingAD J U S T T H E P O W E R P R O P E R T I E S — Search for the keyword sleep in WindowsHelp and Support.SW I T C H T H E V I D E O I M A G E — If your computer is attached to an externalmonitor, press to switch the video image to the display.If the display is difficult to readAD J U S T T H E B R I G H T N E S S — Press and the up- or down-arrow key.MO V E T H E E X T E R N A L S U B W O O F E R A W A Y F R O M T H E C O M P U T E R O R M O N I T O R — Ifyour external speaker system includes a subwoofer, ensure that the subwooferis at least 60 cm (2 ft) away from the computer or external monitor.EL I M I N A T E P O S S I B L E I N T E R F E R E N C E — Turn off nearby fans, fluorescent lights,halogen lamps, or other appliances.RO T A T E T H E C O M P U T E R T O F A C E A D I F F E R E N T D I R E C T I O N — Eliminate sunlightglare, which can cause poor picture quality.AD 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 —Windows XP:1 Click Start→ Control Panel→ Appearance and Themes.2 Click the area you want to change or click the Display icon.3 Try different settings for Color quality and Screen resolution.Windows Vista:1 Click the Windows Vista Start button → Control Panel→ Hardwareand Sound→ Personalization→ Display Settings.2 Adjust Resolution and Colors settings, as needed.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 111, then contact Dell(see "Contacting Dell" on page 165).SE E "ER R O R ME S S A G E S " — If an error message appears, see "Error Messages"on page 123.
