Dell OptiPlex 740 User's Guide - Page 326

C H E C K T H E M O N I T O R P O W E R L I G H T - If the power light is off, firmly press the button to ensure that the monitor is turned on. If the power light is lit or blinking, the monitor has power. If the power light is blinking, press a key on the keyboard or move the mouse. TE S T T H E E L E C T R I C A L O U T L E T - Ensure that the electrical outlet is working by testing it with another device, such as a lamp. TE ST T H E M O N I T O R - Connect a properly working monitor to the computer, and try using the monitor. If the new monitor works, the original monitor is faulty. C H E C K T H E D I A G N O S T I C L I G H T S - See "Diagnostic Lights" on page 330. C H E C K T H E C A R D S E T TI N G - Enter system setup (see "System Setup" on page 257) and ensure that Primary Video option is set correctly. Exit system setup and restart your computer. R U N TH E M O N I T O R S E L F - T E S T - Check the monitor documentation for more information. If the screen is difficult to read C H E C K T H E M O N I T O R S E T T I N G S - See the monitor documentation for instructions on adjusting the contrast and brightness, demagnetizing (degaussing) the monitor, and running the monitor self-test. M O V E T H E S U B W O O F E R A W A Y F R O M T H E M O N I T O R - If your speaker system includes a subwoofer, ensure that the subwoofer is at least 60 cm (2 ft) away from the monitor. M O V E T H E M O N I T O R A W A Y F R O M E X T E R N A L P O W E R S O U R C E S - Fans, fluorescent lights, halogen lamps, and other electrical devices can cause the screen image to appear "shaky." Turn off nearby devices to check for interference. ADJUST THE WINDOWS DISPLAY SETTINGS - 1 Click the Start button, click Control Panel, and then click Appearance and Themes. 2 Click Display and click the Settings tab. 3 Try different settings for Screen resolution and Color quality. 326 Solving Problems