1.Install the latest graphics adapter driver.
2.Configure the most suitable resolution on both of your laptop and LG monitor, make sure they use the same resolution. Turn off the widescreen monitor, restart laptop, login system, next turn on widescreen monitor.
3.Disable Microsoft Transient Multi-Monitor Manager (TMM).
a. Click on Start; in the start search type Task Scheduler and press Enter.
b. In the 'Task Scheduler Library', select Microsoft >>Windows >> Mobile PC.
c. Right click 'TMM' and select 'Disable'.
d. Restart.
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