Acer Aspire Z1620 Acer Aspire Z1620 Desktop Service Guide - Page 120

2. Make sure the computer has power by checking for one of the following:  Fans start up  Status LEDs illuminate If no power, Refer to Power On Issues. 3. Drain stored power by removing the power cable and battery. Hold the power button for 10 seconds. 4. Connect the power and reboot the computer. 5. Connect an external monitor to the computer and switch between the internal display and the external display is by pressing Fn+F5. 6. If the POST or video appears on the external display only, refer to LCD Failure. 7. Disconnect power and all external devices including port replicators or docking stations. Remove any memory cards and CD/DVD discs. 8. Start the computer. If the computer boots correctly, add the devices one by one until the failure point is discovered. 9. Reseat the memory modules. 10.Remove the drives (Refer to Maintenance Flowchart). 11.If the Issue is still not resolved, refer to Online Support Information. Abnormal Video If the video appears abnormal, perform the following: 1. Boot the computer.  If permanent vertical/horizontal lines or dark spots appear in the same location, the LCD is faulty and should be replaced. Refer to Maintenance Flowchart.  If extensive pixel damage is present (different colored spots in the same locations on the screen), the LCD is faulty and should be replaced. Refer to Maintenance Flowchart. NOTE: Make sure that the computer is not running on battery alone as this may reduce display brightness. 2. Adjust the brightness to its highest level. Refer to the User Manual for instructions on adjusting the settings. If the display is too dim at the highest brightness setting, the LCD is faulty and should be replaced. Refer to Maintenance Flowchart. 3. Check the display resolution is correctly configured:  Minimize or close all Windows.  If display size is only abnormal in an application, check the view settings and control/mouse wheel zoom feature in the application. 110