Acer Aspire 4339 4739 4739Z Notebook Series Service Guide
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...video appears abnormal, perform the following: 1. Adjust the brightness to Maintenance Flowchart. If desktop display resolution is faulty and should be replaced. Remove and reinstall the video driver. 6. There are no red Xs or yellow exclamation marks There are no device conflicts No hardware.... 4. If permanent vertical/horizontal lines or dark spots appear in the same location, the LCD is not normal, right-click on -screen prompts. 4-6 Troubleshooting If the POST or video appears on battery alone as this may reduce display brightness. 2. Reseat the memory modules....
...video appears abnormal, perform the following: 1. Adjust the brightness to Maintenance Flowchart. If desktop display resolution is faulty and should be replaced. Remove and reinstall the video driver. 6. There are no red Xs or yellow exclamation marks There are no device conflicts No hardware.... 4. If permanent vertical/horizontal lines or dark spots appear in the same location, the LCD is not normal, right-click on -screen prompts. 4-6 Troubleshooting If the POST or video appears on battery alone as this may reduce display brightness. 2. Reseat the memory modules....