If the display is blankCheck the battery —If you are using a battery to power your computer, the battery charge may be depleted. Connect the computer to an electrical outlet using the AC adapter,and then turn on the computer.Test the electrical outlet —Ensure that the electrical outlet is working by testing it with another device, such as a lamp.Check the AC adapter —Check the AC adapter cable connections. If the AC adapter has a light, ensure that the light is on.Connect the computer directly to an electrical outlet —Bypass power protection devices, power strips, and extension cables to verify that the computer turns on.Adjust the power properties —Search for the keyword sleep in Windows Help and Support.Switch the video image —If your computer is attached to an external monitor, press to switch the video image to the display.If the display is difficult to readAdjust the brightness —Press and the up- or down-arrow key.Move the external subwoofer away from the computer or monitor —If your external speaker system includes a subwoofer, ensure that the subwoofer is at least 60 cm (2 ft) away from the computer or external monitor.Eliminate possible interference —Turn off nearby fans, fluorescent lights, halogen lamps, or other appliances.Rotate the computer to face a different direction —Eliminate sunlight glare, which can cause poor picture quality.Adjust the Windows display settings —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.CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.NOTE: If you are using a program that requires a higher resolution than your computer supports, it is recommended that you attach an external monitorto your computer.
