Dell If the screen is difficult to read

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If the screen is difficult to read
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Testtheelectricaloutlet— Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
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Testthemonitor— Connect a properly working monitor to the computer, and try using the monitor. If the new monitor works, the original
monitor is faulty.
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Check the diagnostic lights — See Diagnostic Lights.
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Checkthecardsetting— Enter system setup (see System Setup) and ensure that Primary Video option is set correctly. Exit system setup
and restart your computer.
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Run the monitor self-test — Check the monitor documentation for more information.
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Checkthemonitorsettings— See the monitor documentation for instructions on adjusting the contrast and brightness, demagnetizing
(degaussing) the monitor, and running the monitor self-test.
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Movethesubwooferawayfromthemonitor— Ifyourspeakersystemincludesasubwoofer,ensurethatthesubwooferisatleast60cm
(2ft)awayfromthemonitor.
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Movethemonitorawayfromexternalpowersources— 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.
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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.